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Chemistry MCQ

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

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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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