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Chemistry MCQ

Hydrocarbons · Maharashtra Board STD 11 Science (MSBSHSE - English Medium). 89 questions.

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89 questions · 88 auto-graded MCQ + 1 self-marked written.

MCQ 21 Mark
Which among the following metals is involved in preparation of Grignard reagent?
  • A
    Silver
  • ✓
    Magnesium
  • C
    Sodium
  • D
    Zinc
Answer
Correct option: B.
Magnesium
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MCQ 31 Mark
For the reaction $\mathrm{N}_{2(\mathrm{~g})}+3 \mathrm{H}_{2(\mathrm{~g})} \rightarrow 2 \mathrm{NH}_{3(\mathrm{~g})}$, rate of disappearance of $\mathrm{N}_{2(\mathrm{~g})}$ is $2.22 \times 10^{-3} \mathrm{~mol} \mathrm{dm}^{-3}$. What is the rate of appearance of $\mathrm{NH}_{3(\mathrm{~g})}$ ?
  • ✓
    $4.44 \times 10^{-3} \mathrm{~mol} \mathrm{dm}^{-3}$
  • B
    $1.11 \times 10^{-3} \mathrm{~mol} \mathrm{dm}^{-3}$
  • C
    $2.22 \times 10^{-3} \mathrm{~mol} \mathrm{dm}^{-3}$
  • D
    $3.33 \times 10^{-3} \mathrm{~mol} \mathrm{dm}^{-3}$
Answer
Correct option: A.
$4.44 \times 10^{-3} \mathrm{~mol} \mathrm{dm}^{-3}$
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MCQ 41 Mark
Which among the following statements is NOT true about aliphatic compounds?
  • A
    Saturated aliphatic compounds undergo substitution reactions.
  • ✓
    These burn with sooty flame.
  • C
    These are easily attacked by oxidizing agent.
  • D
    Unsaturated aliphatic compounds undergo addition reactions easily.
Answer
Correct option: B.
These burn with sooty flame.
B
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MCQ 51 Mark
What product is obtained when alkyl halides react with metallic sodium in presence of dry ether?
  • A
    Alkynes with same number of carbon atoms as in alkyl halide. A)
  • B
    Alkenes with same number of carbon atoms as in alkyl halide.
  • C
    Alkanes with same number of carbon atoms as in alkylhalide. Ω
  • ✓
    Alkanes with double the number of carbon atoms as in alkyl halide
Answer
Correct option: D.
Alkanes with double the number of carbon atoms as in alkyl halide
D
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MCQ 61 Mark
Which of the following alkanes is used for road surfacing?
  • A
    $\mathrm{C}_{20} \mathrm{H}_{42}$ to $\mathrm{C}_{24} \mathrm{H}_{50}$
  • B
    $\mathrm{C}_{10} \mathrm{H}_{22}$ to $\mathrm{C}_{12} \mathrm{H}_{26}$
  • C
    $\mathrm{C}_{15} \mathrm{H}_{32}$ to $\mathrm{C}_{19} \mathrm{H}_{40}$
  • ✓
    $\mathrm{C}_{36} \mathrm{H}_{74}$ and above
Answer
Correct option: D.
$\mathrm{C}_{36} \mathrm{H}_{74}$ and above
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MCQ 81 Mark
Which among the following metals is involved in preparation of Grignard reagent?
  • A
    Silver
  • ✓
    Magnesium
  • C
    Sodium
  • D
    Zinc
Answer
Correct option: B.
Magnesium
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MCQ 91 Mark
For the reaction $\mathrm{N}_{2(\mathrm{~g})}+3 \mathrm{H}_{2(\mathrm{~g})} \rightarrow 2 \mathrm{NH}_{3(\mathrm{~g})}$, rate of disappearance of $\mathrm{N}_{2(\mathrm{~g})}$ is $2.22 \times 10^{-3} \mathrm{~mol} \mathrm{dm}^{-3}$. What is the rate of appearance of $\mathrm{NH}_{3(\mathrm{~g})}?$
  • ✓
    $4.44 \times 10^{-3} \mathrm{~mol} \mathrm{dm}^{-3}$
  • B
    $1.11 \times 10^{-3} \mathrm{~mol} \mathrm{dm}^{-3}$
  • C
    $2.22 \times 10^{-3} \mathrm{~mol} \mathrm{dm}^{-3}$
  • D
    $3.33 \times 10^{-3} \mathrm{~mol} \mathrm{dm}^{-3}$
Answer
Correct option: A.
$4.44 \times 10^{-3} \mathrm{~mol} \mathrm{dm}^{-3}$
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MCQ 101 Mark
Which among the following statements is NOT true about aliphatic compounds?
  • A
    Saturated aliphatic compounds undergo substitution reactions.
  • ✓
    These burn with sooty flame.
  • C
    These are easily attacked by oxidizing agent.
  • D
    Unsaturated aliphatic compounds undergo addition reactions easily.
Answer
Correct option: B.
These burn with sooty flame.
B
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MCQ 111 Mark
What product is obtained when alkyl halides react with metallic sodium in presence of dry ether?
  • A
    Alkynes with same number of carbon atoms as in alkyl halide. A)
  • B
    Alkenes with same number of carbon atoms as in alkyl halide.
  • C
    Alkanes with same number of carbon atoms as in alkylhalide. Ω
  • ✓
    Alkanes with double the number of carbon atoms as in alkyl halide
Answer
Correct option: D.
Alkanes with double the number of carbon atoms as in alkyl halide
D
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MCQ 121 Mark
Which of the following alkanes is used for road surfacing?
  • A
    $\mathrm{C}_{20} \mathrm{H}_{42}$ to $\mathrm{C}_{24} \mathrm{H}_{50}$
  • B
    $\mathrm{C}_{10} \mathrm{H}_{22}$ to $\mathrm{C}_{12} \mathrm{H}_{26}$
  • C
    $\mathrm{C}_{15} \mathrm{H}_{32}$ to $\mathrm{C}_{19} \mathrm{H}_{40}$
  • ✓
    $\mathrm{C}_{36} \mathrm{H}_{74}$ and above
Answer
Correct option: D.
$\mathrm{C}_{36} \mathrm{H}_{74}$ and above
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MCQ 131 Mark
1 – chloropropane on treatment with alc. KOH produces :
  • A
    propane
  • ✓
    propene
  • C
    propyne
  • D
    propyl alcohol
Answer
Correct option: B.
propene
propene
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MCQ 141 Mark
Major product of chlorination of ethyl benzene is :
  • A
    m-chlorethyl benzene
  • ✓
    p-chloroethyl benzene
  • C
    chlorobenzene
  • D
    o-chloroethylbenzene
Answer
Correct option: B.
p-chloroethyl benzene
p-chloroethyl benzene
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MCQ 151 Mark
Identify ‘A’ in the following reaction: 
Image
  • ✓
    $KMnO _4 / H ^{+}$
  • B
    alkaline $KMnO _4$
  • C
    dil. $H _2 SO _4 / 1 \% HgSO _4$
  • D
    $NaOH / H _2 O _2$
Answer
Correct option: A.
$KMnO _4 / H ^{+}$
$KMnO _4 / H ^{+}$
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MCQ 161 Mark
Acidic hydrogen is present in :
  • ✓
    acetylene
  • B
    ethane
  • C
    ethylene
  • D
    dimethyl acetylene
Answer
Correct option: A.
acetylene
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MCQ 171 Mark
Which of the following compound has the highest boiling point?
  • ✓
    n-pentane
  • B
    iso-butane
  • C
    butane
  • D
    neopentane
Answer
Correct option: A.
n-pentane
n-pentane
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MCQ 181 Mark
What is the number of moles of $s p^2$ hybrid carbon atoms in one mole of hexa-1,4-diyne?
  • A
    5
  • B
    3
  • C
    4
  • ✓
    Zero
Answer
Correct option: D.
Zero
(d):

There is no $s p^2$ hybridised carbon atom in hexa-1,4-diyne.
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MCQ 191 Mark
Which of the following is not obtained when a mixture of methyl chloride and $n-$propyl chloride is treated with sodium metal in dry ether?
  • A
    Ethane
  • ✓
    Propane
  • C
    Butane
  • D
    Hexane
Answer
Correct option: B.
Propane
When two alkyl halides react in the presence of sodium metal, alkane is formed. When a mixture of methyl chloride and $n-$propyl chloride react in presence of $Na$ metal, ethane, butane and hexane are formed.
$ H _3 CCl + CH _3 Cl \xrightarrow{ Na } H _3 C - CH _3$
$\text { Methyl Methyl Ethane }$
$\text { chloride chloride }$
Image
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MCQ 201 Mark
Identify major product formed in the following reaction. 3-Bromo-2-methylpentane $\xrightarrow[\Delta]{\text { Alc. } KOH }$ Major product
  • A
    2-Methylpentan-3-ol
  • ✓
    2-Methylpent-2-ene
  • C
    4-Methylpent-3-ene
  • D
    4-Methylpentan-3-ol
Answer
Correct option: B.
2-Methylpent-2-ene
(b):
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MCQ 211 Mark
What is the number of moles of ethane obtained from $2 n$ moles of bromomethane using $2 n$ moles of sodium atoms in dry ether medium?
  • A
    $4 n$
  • B
    $3 n$
  • C
    $2 n$
  • ✓
    $n$
Answer
Correct option: D.
$n$
(d): $\underset{\substack{(2 \text { moles }) \\ 2 n}}{2 CH _3 Br } \frac{2 Na }{(2 \text { moles })} \underset{(1 \text { mole })}{ CH _3- CH _3}+\underset{(2 \text { moles })}{2 NaBr }$
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MCQ 221 Mark
Which from following molecules does not contain nitrogen in it?
  • A
    Pyrrole
  • B
    Piperidine
  • C
    Pyridine
  • ✓
    Pyran
Answer
Correct option: D.
Pyran
(d):
Image
Pyran does not contain any ' $N$ ' atom.
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MCQ 231 Mark
Which of the following is formed when propene is heated with bromine at high temperature?
  • A
    1,2-Dibromopropane
  • B
    1-Bromopropane
  • C
    2-Bromopropane
  • ✓
    3-Bromopropene
Answer
Correct option: D.
3-Bromopropene
(d): $\underset{\text { Propene }}{ CH _3 CH }= CH _2 \xrightarrow[\text { High temperature }]{ Br _2} CH _2=\underset{\text { 3-Bromopropene }}{ CH }- CH _2 Br$
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MCQ 241 Mark
What is the number of moles of tertiary carbon atoms in a molecule of isobutane?
  • ✓
    One
  • B
    Two
  • C
    Three
  • D
    Four
Answer
Correct option: A.
One
(a):

There is only one tertiary $C$ atom in isobutane and rest are primary $C$ atoms.

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MCQ 251 Mark
Which of the following reactions is used to prepare toluene from bromobenzene?
  • A
    Wurtz reaction
  • B
    Fittig reaction
  • ✓
    Wurtz-Fittig reaction
  • D
    Swartz reaction
Answer
Correct option: C.
Wurtz-Fittig reaction
(c):
Image
When a mixture of an alkyl halide and aryl halide is treated with sodium in dry ether, an alkyl arene is obtained. This reaction is known as Wurtz-Fittig reaction.
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MCQ 261 Mark
How many $\pi$ electrons are present in naphthalene to decide its aromaticity?
  • A
    6
  • B
    7
  • C
    8
  • ✓
    10
Answer
Correct option: D.
10
(d)
Image
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MCQ 271 Mark
When $n$-hexane is heated with anhydrous $AlCl _3$ and $HCl$ gas, the major product(s) obtained is/are
  • ✓
    mixture of 2-methylpentane and 3-methylpentane
  • B
    2-chlorohexane
  • C
    3-chlorohexane
  • D
    hex-3-ene.
Answer
Correct option: A.
mixture of 2-methylpentane and 3-methylpentane
(a): When $n$-hexane is heated with anhydrous $AlCl _3$ and $HCl$ gas, the major products obtained are mixture of 2-methylpentane and 3-methylpentane.
Image
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MCQ 281 Mark
In the reaction, $2 n R-X \xrightarrow[\text { Dry cther }]{+2 n Na }$ product, the product obtained is
  • A
    $2 n$ Alkene
  • B
    $n$ Sodium halide
  • C
    $n$ Alcohol
  • ✓
    $n$ Alkane.
Answer
Correct option: D.
$n$ Alkane.
(d): $2 n R-X+2 n Na \xrightarrow{-2 n NaX } n R-R$
Alkane
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MCQ 291 Mark
How many isomers are possible for an alkane having molecular formula $C _5 H _{12}$ ?
  • A
    5
  • ✓
    3
  • C
    4
  • D
    2
Answer
Correct option: B.
3
(b): Three isomers are possible for an alkane having molecular formula $C _5 H _{12}$.
$
CH _3- CH _2- CH _2- CH _2- CH _3
$
$n$-Pentane
Image
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MCQ 301 Mark
The electrophile in Friedel-Craft’s alkylation reaction is ………….
  • ✓
    $R^{+}$
  • B
    $R ^{-}$
  • C
    $Cl ^{+}$
  • D
    $RCO ^{+}$
Answer
Correct option: A.
$R^{+}$
(A) $R^{+}$
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MCQ 311 Mark
Ethyl chloride reacts with benzene in presence of anhydrous aluminium chloride to form ………….
  • ✓
    ethyl benzene
  • B
    chlorobenzene
  • C
    toluene
  • D
    acetophenone
Answer
Correct option: A.
ethyl benzene
(A) ethyl benzene
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MCQ 321 Mark
Benzene when treated with fuming. $H_2SO_4 $ at $373 K$ forms $…….$
  • A
    ethylbenzene
  • B
    toluene
  • ✓
    benzene sulphonic acid
  • D
    acetophenone sulphonic acid
Answer
Correct option: C.
benzene sulphonic acid
benzene sulphonic acid
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MCQ 331 Mark
Electrophile in chlorination of benzene is ………….
  • A
    $Cl$
  • ✓
    $Cl ^{+}$
  • C
    $Cl ^{-}$
  • D
    $Cl _2$
Answer
Correct option: B.
$Cl ^{+}$
(B) $Cl ^{+}$
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MCQ 341 Mark
…………. is formed as intermediate product in ozonolysis of benzene.
  • A
    Benzaldehyde
  • B
    Phenol
  • ✓
    Benzene triozonide
  • D
    Cyclohexane
Answer
Correct option: C.
Benzene triozonide
(C) Benzene triozonide
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MCQ 351 Mark
Benzene when treated with ozone forms ………….
  • ✓
    glyoxal
  • B
    acetic acid
  • C
    formaldehyde
  • D
    benzaldehyde
Answer
Correct option: A.
glyoxal
(A) glyoxal
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MCQ 361 Mark
γ-isomer of BHC is known as ………….
  • A
    gammene
  • ✓
    gammaxane
  • C
    chlorobenzene
  • D
    hexachlorobenzene
Answer
Correct option: B.
gammaxane
(B) gammaxane
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MCQ 371 Mark
X-Ray diffraction reveals that benzene is a …………. structure.
  • A
    triangular
  • ✓
    planar
  • C
    co-planar
  • D
    3D
Answer
Correct option: B.
planar
(B) planar
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MCQ 381 Mark
Which of the following compound on reduction gives benzene?
  • A
    Sodium benzoate
  • B
    Acetylene
  • C
    Cyclohexane
  • ✓
    Phenol
Answer
Correct option: D.
Phenol
(D) Phenol
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MCQ 401 Mark
If the substituents are on the adjacent carbon atoms in the benzene ring, it is called ………….
  • A
    meta
  • B
    para
  • ✓
    ortho
  • D
    beta
Answer
Correct option: C.
ortho
(C) ortho
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MCQ 411 Mark
Benzene undergoes ………….
  • A
    only addition reaction
  • B
    only substitution reaction
  • ✓
    both addition and substitution reactions
  • D
    nucleophilic substitution reactions
Answer
Correct option: C.
both addition and substitution reactions
(C) both addition and substitution reactions
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MCQ 421 Mark
Which of the following compounds does NOT contain any benzene rings in their structure?
  • A
    Benzaldehyde
  • B
    Benzoic acid
  • C
    Naphthalene
  • ✓
    Furan
Answer
Correct option: D.
Furan
(D) Furan
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MCQ 431 Mark
The compounds which contain at least one benzene ring are ………….
  • A
    aliphatic compounds
  • ✓
    aromatic compound
  • C
    cycloalkanes
  • D
    both (A) and (B)
Answer
Correct option: B.
aromatic compound
(B) aromatic compounds
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MCQ 441 Mark
When acetylene is passed through dil $H _2 SO _4$ in the presence of $1 \%$ mercuric sulphate, the compound formed is ……………..
  • A
    ethanol
  • B
    acetone
  • ✓
    acetaldehyde
  • D
    acetic acid
Answer
Correct option: C.
acetaldehyde
(C) acetaldehyde
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MCQ 451 Mark
Liquid bromine reacts with acetylene to form ………….
  • A
    1,2-dibromoethene
  • ✓
    1,1,2,2-tetrabromoethane
  • C
    1,1-dibromoethene
  • D
    methyl chloride
Answer
Correct option: B.
1,1,2,2-tetrabromoethane
(B) 1,1,2,2-tetrabromoethane
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MCQ 461 Mark
Alkynes readily undergo …………. reaction.
  • ✓
    addition
  • B
    substitution
  • C
    elimination
  • D
    rearrangement
Answer
Correct option: A.
addition
(A) addition
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MCQ 471 Mark
The dihalogen derivatives of alkanes when heated with …………. form corresponding alkynes.
  • A
    alcoholic water
  • ✓
    sodamide
  • C
    zinc
  • D
    acids
Answer
Correct option: B.
sodamide
(B) sodamide
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MCQ 481 Mark
Acetylene is prepared in the industry by the action of water on ………….
  • A
    calcium carbonate
  • ✓
    calcium carbide
  • C
    mercuric chloride
  • D
    calcium oxide
Answer
Correct option: B.
calcium carbide
(B) calcium carbide
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MCQ 491 Mark
Aliphatic unsaturated hydrocarbons containing two carbon-carbon triple bonds in their structure are called as ………….
  • ✓
    alkadiynes
  • B
    alkatriynes
  • C
    alkynes
  • D
    alkanes
Answer
Correct option: A.
alkadiynes
(A) alkadiynes
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MCQ 501 Mark
Alkynes have general formula ........ .
  • ✓
    $C _n H _{2 n-2}$
  • B
    $C _n H _{2 n}$
  • C
    $C _n H _{2 n+2}$
  • D
    $C _n H _{2 n+1}$
Answer
Correct option: A.
$C _n H _{2 n-2}$
(A) $C _n H _{2 n-2}$
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MCQ 511 Mark
Baeyer’s reagent is ………….
  • A
    aqueous $KMnO _4$
  • B
    neutral $KMnO _4$
  • ✓
    alkaline $KMnO _4$
  • D
    aqueous bromine water
Answer
Correct option: C.
alkaline $KMnO _4$
(C) alkaline $KMnO _4$
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MCQ 521 Mark
Ethylene reacts with Baeyer’s reagent to give a/an ………….
  • ✓
    glycol
  • B
    aldehyde
  • C
    acid
  • D
    alcohol
Answer
Correct option: A.
glycol
(A) glycol
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MCQ 531 Mark
An alkene on vigorous oxidation with $KMnO _4$ gives only acetic acid. The alkene is ........ .
  • A
    $CH _3 CH _2 CH = CH _2$
  • ✓
    $CH _3 CH = CHCH _3$
  • C
    $\left( CH _3\right)_2 C = CH _2$
  • D
    $CH _3 CH = CH _2$
Answer
Correct option: B.
$CH _3 CH = CHCH _3$
(B) $CH _3 CH = CHCH _3$
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MCQ 541 Mark
The reaction, $CH _2= CH _2+ H _2 O +[ O ]$ $\xrightarrow{\text { cold alk. } KMnO _4} HOCH _2- CH _2 OH$ is called ............ .
  • ✓
    hydroxylation
  • B
    decarboxylation
  • C
    hydration
  • D
    dehydration
Answer
Correct option: A.
hydroxylation
(A) hydroxylation
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MCQ 551 Mark
Ozonolysis of 2,3-Dimethylbut-1-ene followed by reduction with zinc and water gives ………….
  • A
    methanoic acid and 3-methylbutan-2-one
  • B
    methanal and 2-methylbutan-2-one
  • ✓
    methanal and 3-methylbutan-2-one
  • D
    methanoic acid and 2-methylbutan-2-one
Answer
Correct option: C.
methanal and 3-methylbutan-2-one
(C) methanal and 3-methylbutan-2-one
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MCQ 561 Mark
Treatment of ethylene with ozone followed by decomposition of the product with $Zn/H_2O$ gives two moles of $……..$
  • ✓
    formaldehyde
  • B
    acetaldehyde
  • C
    formic acid
  • D
    acetic acid
Answer
Correct option: A.
formaldehyde
formaldehyde
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MCQ 571 Mark
The compound which forms only acetaldehyde on ozonolysis is …………..
  • A
    ethene
  • B
    propyne
  • C
    but-1-ene
  • ✓
    but-2-ene
Answer
Correct option: D.
but-2-ene
(D) but-2-ene
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MCQ 581 Mark
The ozonolysis of $\left( CH _3\right)_2 C = C \left( CH _3\right)_2$ followed by treatment with zinc and water will give ………………..
  • ✓
    acetone
  • B
    acetone and acetaldehyde
  • C
    formaldehyde and acetone
  • D
    acetaldehyde
Answer
Correct option: A.
acetone
(A) acetone
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MCQ 591 Mark
An alkene on ozonolysis produces a mixture of acetaldehyde and acetone. Identify the alkene.
  • A
    But-1-ene
  • B
    But-2-ene
  • C
    2-Methylbut-1-ene
  • ✓
    2-Methylbut-2-ene
Answer
Correct option: D.
2-Methylbut-2-ene
(D) 2-Methylbut-2-ene
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MCQ 601 Mark
The addition of HCl in presence of peroxide does not follow anti-Markownikov’s rule because …………..
  • ✓
    HCl bond is too strong to be broken homolytically
  • B
    Cl atom is not reactive enough to add on to a double bond
  • C
    Cl atom combines with H atom to form HCl
  • D
    HCl is a reducing agent
Answer
Correct option: A.
HCl bond is too strong to be broken homolytically
(A) HCl bond is too strong to be broken homolytically
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MCQ 611 Mark
Markovnikov’s rule is applicable for …………..
  • A
    $CH _2= CH _2$
  • B
    $CH _3 CH = CHCH _3$
  • C
    $CH _3 CH _2 CH = CHCH _2 CH _3$
  • ✓
    $\left( CH _3\right)_2 C = CH _2$
Answer
Correct option: D.
$\left( CH _3\right)_2 C = CH _2$
(D) $\left( CH _3\right)_2 C = CH _2$
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MCQ 621 Mark
Propene reacts with HBr in presence of peroxide, to form …………..
  • A
    2-bromopropane
  • ✓
    1-bromopropane
  • C
    3-bromopropane
  • D
    1,2-dibromopropane
Answer
Correct option: B.
1-bromopropane
(B) 1-bromopropane
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MCQ 631 Mark
The product formed by the addition of HCl to propene in presence of peroxide is …………..
  • A
    $CH _3 CH _2 CH _2 Cl$
  • B
    Image
  • C
    Image
  • D
    $ClCH _2 CH _2 CH _2 Cl$
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MCQ 641 Mark
When propene is treated with HBr in the dark and in absence of peroxide, then the main product formed is …………
  • A
    1-bromopropane
  • ✓
    2-bromopropane
  • C
    1,2-dibromopropane
  • D
    1,3-dibromopropane
Answer
Correct option: B.
2-bromopropane
(B) 2-bromopropane
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MCQ 651 Mark
Markownikov’s rule is applicable to …………
  • A
    symmetrical alkenes
  • B
    alkanes
  • ✓
    unsymmetrical alkenes
  • D
    alkynes
Answer
Correct option: C.
unsymmetrical alkenes
(C) unsymmetrical alkenes
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MCQ 661 Mark
Alkenes are insoluble in …………
  • A
    benzene
  • ✓
    water
  • C
    ether
  • D
    chloroform
Answer
Correct option: B.
water
(B) water
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MCQ 671 Mark
When ethyl bromide is heated with alcoholic KOH, ………… is formed.
  • A
    ethane
  • B
    ethanol
  • ✓
    ethene
  • D
    acetylene
Answer
Correct option: C.
ethene
(C) ethene
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MCQ 681 Mark
Which of the following does NOT exhibit geometrical isomers?
  • A
    But-2-ene
  • B
    Pent-2-ene
  • ✓
    But-1-ene
  • D
    Hex-2-ene
Answer
Correct option: C.
But-1-ene
(C) But-1-ene
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MCQ 691 Mark
When identical atoms or group of atoms are attached to the two carbon atoms on the same side of the double bond, the isomer is called ………… isomer.
  • ✓
    cis
  • B
    trans
  • C
    position
  • D
    chain
Answer
Correct option: A.
cis
(A) cis
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MCQ 701 Mark
Which of the following shows position isomerism?
  • A
    Propene
  • B
    Ethene
  • C
    2-Methylpropene
  • ✓
    Pent-2-ene
Answer
Correct option: D.
Pent-2-ene
(D) Pent-2-ene
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MCQ 711 Mark
Hex-2-ene and 2-Methylpent-2-ene exhibit …………
  • ✓
    chain isomerism
  • B
    position isomerism
  • C
    geometrical isomerism
  • D
    optical isomerism
Answer
Correct option: A.
chain isomerism
(A) chain isomerism
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MCQ 721 Mark
But-1-ene and But-2-ene are …………
  • A
    chain isomers
  • ✓
    position isomers
  • C
    geometrical isomers
  • D
    metamers
Answer
Correct option: B.
position isomers
(B) position isomers
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MCQ 731 Mark
The thermal decomposition of alkanes in absence of air to give lower alkanes, alkenes and hydrogen is called ………….
  • A
    vapour phase nitration
  • ✓
    pyrolysis
  • C
    polymerisation
  • D
    combustion
Answer
Correct option: B.
pyrolysis
(B) pyrolysis
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MCQ 741 Mark
Order of reactivity of halogens in halogenation of alkanes is ………….
  • ✓
    $F _2> Cl _2> Br _2> I _2$
  • B
    $I _2> Br _2> Cl _2> F _2$
  • C
    $Br _2< I _2< F _2< Cl _2$
  • D
    $Cl _2< I _2< Br _2< F _2$
Answer
Correct option: A.
$F _2> Cl _2> Br _2> I _2$
(A) $F _2> Cl _2> Br _2> I _2$
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MCQ 751 Mark
Halogenation of alkane is an example of …………. reaction.
  • A
    dehydration
  • ✓
    substitution
  • C
    addition
  • D
    elimination
Answer
Correct option: B.
substitution
(B) substitution
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MCQ 761 Mark
As branching increases, boiling point of alkanes ………….
  • A
    increases
  • ✓
    decreases
  • C
    remains same
  • D
    None of these
Answer
Correct option: B.
decreases
(B) decreases
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MCQ 771 Mark
Alkanes are ………… in water.
  • A
    soluble
  • B
    sparingly soluble
  • ✓
    insoluble
  • D
    none of these
Answer
Correct option: C.
insoluble
(C) insoluble
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MCQ 781 Mark
Methane is ………… molecule.
  • A
    polar
  • ✓
    nonpolar
  • C
    highly polar
  • D
    none of these
Answer
Correct option: B.
nonpolar
(B) nonpolar
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MCQ 791 Mark
The reaction of alkyl halides with sodium in dry ether to give higher alkanes is called ………..
  • ✓
    Wurtz reaction
  • B
    Kolbe’s reaction
  • C
    Frankland’s reaction
  • D
    Williamson’s reaction
Answer
Correct option: A.
Wurtz reaction
(A) Wurtz reaction
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MCQ 801 Mark
Ethyl iodide when reduced by zinc and dilute HCl, leads to the formation of …………..
  • A
    Methane
  • ✓
    Ethane
  • C
    Ethylene
  • D
    Butane
Answer
Correct option: B.
Ethane
(B) Ethane
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MCQ 811 Mark
Catalytic hydrogenation of ethene or acetylene gives …………..
  • ✓
    ethane
  • B
    propylene
  • C
    methane
  • D
    propane
Answer
Correct option: A.
ethane
(A) ethane
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MCQ 821 Mark
Alkanes can be prepared by ………… of unsaturated hydrocarbons.
  • ✓
    hydrogenation
  • B
    oxidation
  • C
    hydrolysis
  • D
    cracking
Answer
Correct option: A.
hydrogenation
(A) hydrogenation
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MCQ 831 Mark
Which of the following is NOT an isomer of hexane?
  • A
    2-Methylpentane
  • B
    2,2-Dimethylbutane
  • ✓
    2,2-Dimethylpentane
  • D
    3-Methylpentane
Answer
Correct option: C.
2,2-Dimethylpentane
(C) 2,2-Dimethylpentane
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MCQ 851 Mark
Isomerism is the phenomenon in which two or more organic compounds have ………….
  • ✓
    same molecular formula but different structural formula
  • B
    same structural formula but different molecular formula
  • C
    same general formula, but different structural formula
  • D
    same empirical formula, same structural formula
Answer
Correct option: A.
same molecular formula but different structural formula
(A) same molecular formula but different structural formula
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MCQ 861 Mark
Every carbon atom in alkanes is …………..
  • A
    sp hybridized
  • B
    $sp ^2$ hybridized
  • ✓
    $sp ^3$ hybridized
  • D
    $s p^3 d$ hybridized
Answer
Correct option: C.
$sp ^3$ hybridized
(C) $sp ^3$ hybridized
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MCQ 871 Mark
Alkanes are commonly called …………
  • A
    arenes
  • ✓
    paraffins
  • C
    olefins
  • D
    acetylenes
Answer
Correct option: B.
paraffins
(B) paraffins
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MCQ 881 Mark
Which of the following compound is alkanes?
  • A
    $C _5 H _{10}$
  • ✓
    $C _{10} H _{22}$
  • C
    $C _{15} H _{28}$
  • D
    $C _9 H _{16}$
Answer
Correct option: B.
$C _{10} H _{22}$
(B) $C _{10} H _{22}$
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MCQ 891 Mark
Alkanes are represented by the general formula ........... .
  • A
    $C _n H _{2 n-2}$
  • ✓
    $C _n H _{2 n+2}$
  • C
    $C _n H _{2 n}$
  • D
    $C _n H _n$
Answer
Correct option: B.
$C _n H _{2 n+2}$
(B) $C _n H _{2 n+2}$
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