M.C.Q (1 Marks)

MCQ 11 Mark

Give IUPAC name of the compound given below.

A
2-Chloro-5-hydroxyhexane
B
5-Chlorohexan - 2 - ol
C
2-Hydroxy-5-chlorohexane
✓
2-Chlorohexan - 5 - ol

Answer

Correct option: D.

2-Chlorohexan - 5 - ol

(d) II < I < III

Electron withdrawing group decreases the basic strength of aniline while electron releasing groups increases the basic strength of aniline.

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MCQ 21 Mark

The correct increasing order of basic strength for the following compounds is __________ .

A
III < I < II
✓
III < II < I
C
II < III < I
D
II < I < III

Answer

Correct option: B.

III < II < I

(b) 5-Chlorohexan - 2 - ol

-OH is given preference over -Cl so numbering is done so that -OH gets the lowest number.

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MCQ 31 Mark

How to do the following conversion: $RCOOCI + ? \rightarrow RCHO$

A
Using $H_2-Pd, BaSO_4$
B
Using $ \text{DIBAL-H}$
C
Using $H_2 - Pd$
D
Using $NaBH_4$

Answer

Catalytic hydrogenation of acid chloride using $H_2-Pd, BaSO_4$ converts acid chloride selectively to aldehydes $(BaSO_4$ reduces the activity of palladium$).$ This is known as Rosenmund Reduction.

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MCQ 41 Mark

The slope of the line in the plot of concentration [A] Vs. time (s) indicate

A
$+ k$
✓
$- k$
C
$\frac{+k}{2.303}$
D
$\frac{-k}{2.303}$

Answer

Correct option: B.

$- k$

(b) -k
Explanation: Slop of the line indicates = -k while the intercept represents [R]0.

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MCQ 51 Mark

Among the following, which bivalent ion of the first transition series shows a maximum magnetic moment?

A
$Co^{2+}$
B
$Ni^{2+}$
✓
$Mn^{2+}$
D
$Fe^{2+}$

Answer

Correct option: C.

$Mn^{2+}$

$Mn^{2+}$ has $d^5$ configuration so a maximum number of unpaired electrons and hence maximum magnetic moment. This magnetic moment can be calculated by using the spin only formula: $\mu_{so} = \angle n(n+2),$ where $n=$ number of unpaired electrons.

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MCQ 61 Mark

Carbon tetrachloride has a dipole moment:

✓
$\mu=0$
B
$\mu=1$
C
$\mu=2$
D
$\mu=4$

Answer

Correct option: A.

$\mu=0$

$\ce{CCl_4}$ is a symmetrical molecule. Hence, the dipole moment is zero.

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MCQ 71 Mark

Match the items of column $I$ with appropriate entries of column $II.$

Column $I$	Column $II$
$(a) \frac{\Delta P }{ P ^{\circ}{ }_A}$	$(i) \ \frac{\Delta T _{ b }}{ m }$
$(b) \ K_b$	$(ii) \ mol$ fraction of solute
$(c) \ i$	$(iii) \ \frac{\Delta T _{ f }}{ m }$
$(d) \ K_f$	$(iv)$ Ratio of observed molar mass to actual molar mass

✓
$(a) (ii), (b) - (i), (c) - (iv), (d) - (iii)$
B
$(a) (iv), (b) - (i), (c) - (ii), (d) - (iii)$
C
$(a) (ii), (b) - (iv), (c) - (i), (d) - (iii)$
D
$(a) (iv), (b) - (iii), (c) - (ii), (d) - (i)$

Answer

Correct option: A.

$(a) (ii), (b) - (i), (c) - (iv), (d) - (iii)$

$(a) - (ii), (b) - (i), (c) - (iv), (d) - (iii)$

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MCQ 81 Mark

If $75\%$ of a first order reaction was completed in $32\ min,$ then $50\%$ of the reaction was completed in $........$

A
$24\ min$
B
$4\ min$
✓
$16\ min$
D
$8\ min$

Answer

Correct option: C.

$16\ min$

$75\%$ completion means $2$ half lifes so $50\%$ completion means only one half life.
$k=\frac{2.303}{t} \log \frac{a}{a-x}$
$k=\frac{2.303}{32} \log \left(\frac{100}{100-75}\right) \ldots(1)$
$k=\frac{2.303}{t} \log \left(\frac{100}{100-50}\right) \ldots(2)$
from $(1)$ and $(2),$ we get
$t = 16\ mins$

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MCQ 91 Mark

The common name for pentanedioic acid is:

A
Succinic acid
B
Pimelic acid
C
Oxalic acid
✓
Glutaric acid

Answer

Correct option: D.

Glutaric acid

$\rightarrow$ Pentanedioic acid is known as glutaric acid.
$\rightarrow \ce{(COOH)_{2}}$ is known as oxalic acid.
$\rightarrow$ Butanedioic acid is known as succinic acid.
$\rightarrow$ Hexanedioic acid is known as adipic acid.
$\rightarrow$ Heptanedioic acid is known as pimelic acid.

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MCQ 101 Mark

One mole of an organic compound $ 'A \ '$ with the formula $\ce{C_3H_8O}$ reacts completely with two moles of $\ce{HI}$ to form $X$ and $Y.$ When $' \ Y \ '$ is boiled with aqueous alkali forms $\text{Z. Z}$ answers the iodoform test. The compound $'A \ '$ is $.......$

A
methoxyethane
B
ethoxyethane
✓
Propan$-2-01$
D
Propan$-1-01$

Answer

Correct option: C.

Propan$-2-01$

Ether reacts with $\ce{HI}$ to form alcohol and alkyl iodide. Alcohol on oxidation will give the iodoform test.

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MCQ 111 Mark

DNA fingerprinting means the

A
sequencing the nucleotides in DNA
B
sequencing the bases present in double helix
✓
information regarding the unique sequence of bases on DNA for a person
D
information reagrding the unique imprints on the fingertip for a person

Answer

Correct option: C.

information regarding the unique sequence of bases on DNA for a person

(c) information regarding the unique sequence of bases on DNA for a person
Explanation: A sequence of bases on DNA is unique for a person and information regarding this is called DNA fingerprinting. It is same for every cell and cannot be altered by any known treatment.

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MCQ 121 Mark

The order of reactivity of following alcohols with halogen acids is ______.

A
(A) > (C) > (B)
✓
(C) > (B) > (A)
C
(B) > (A) > (C)
D
(A) > (B) > (C)

Answer

Correct option: B.

(b) (C) > (B) > (A)
Explanation: Haloalkanes are prepared from alcohol and halogen acids where the hydroxyl group of the alcohol is replaced by the halogen. Options (A) (B) and (C) are primary, secondary, tertiary alcohols respectively. Tertiary alcohols are more reactive than secondary and primary alcohol, the secondary halide is more reactive than primary halide and they form haloalkanes from haloacids at room temperature without catalysts. The order of reactivity of alcohols is 3°>2°>1°.

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Chemistry M.C.Q (1 Marks)

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