M.C.Q (1 Marks)

MCQ 11 Mark

Which of the following compound gives an oxime with hydroxylamine:

✓
$\ce{CH_3COCH_3}$
B
$\ce{CH_3COCH}$
C
$\ce{(CH_3CO)_2O}$
D
$\ce{CH_3COCI}$

Answer

Correct option: A.

$\ce{CH_3COCH_3}$

Aldehyde and ketones give nucleophilic addition reactions. Other carbonyl compounds do not give nucleophilic addition reactions

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MCQ 21 Mark

A student was preparing aniline in the lab. She took a compound "X" and reduced it in the presence of Ni as a catalyst. What could be the compound "X"

✓
Nitrobenzene
B
1-Nitrohexane
C
Benzonitrile
D
1-Hexanenitrile

Answer

Correct option: A.

Nitrobenzene

(a) Nitrobenzene

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MCQ 31 Mark

A first$-$order reaction is found to have a rate constant, $k = 5.5 \times 10^{-1}4s^{-1}.$ The time taken for completion of the reaction is:

A
$1.26 \times 10^{13} s$
B
$2.52 \times 10^{13} s$
C
$0.63 \times 10^{13} s$
✓
It never goes to completion

Answer

Correct option: D.

It never goes to completion

First order reaction $[R] = [Ro] e^{-kt}$ If $[R]=0$ then
$e^{- kt} = 0$ which is not possible for any finite value of $t.$
Here, $t$ is $\infty $.

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MCQ 41 Mark

Which one of the following sets correctly represents the increase in the paramagnetic property of the ions?

A
$\mathrm{Ti}^{3+}<\mathrm{Fe}^{2+}<\mathrm{Cr}^{3+}<\mathrm{Mn}^{2+}$
B
$\mathrm{Ti}^{3+}<\mathrm{Mn}^{2+}<\mathrm{Fe}^{2+}<\mathrm{Cr}^{3+}$
C
$\mathrm{Mn}^{2+}<\mathrm{Fe}^{2+}<\mathrm{Cr}^{3+}<\mathrm{Ti}^{3+}$
✓
$\mathrm{Ti}^{3+}<\mathrm{Cr}^{3+}<\mathrm{Fe}^{2+}<\mathrm{Mn}^{2+}$

Answer

Correct option: D.

$\mathrm{Ti}^{3+}<\mathrm{Cr}^{3+}<\mathrm{Fe}^{2+}<\mathrm{Mn}^{2+}$

No. of unpaired electrons $Ti^{3+}(1), Cr^{3+}(3), Fe^{2+ }(4)$ and $Mn^{2+} (5)$ Paramagnetism depends on the number of unpaired electrons

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MCQ 51 Mark

Which of the following contains only ẞ-D- glucose as its monosaccharide unit:

A
Sucrose
✓
Cellulose
C
Starch
D
Maltose

Answer

Correct option: B.

Cellulose

(b) Cellulose
Starch contains only a glucose, sucrose contains α-D-glucose and ß-D-fructose glucose, maltose contains α-D-glucose and cellulose is a polymer of ß-D-glucose.

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MCQ 61 Mark

'X' and 'Y' in the above table are

A
$X=\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{2+} 3 \mathrm{Cl}^{-}, \mathrm{Y}=1: 3$
✓
$X=\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right]^{+} \mathrm{Cl},-\mathrm{Y}=1: 3$
C
$X=\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right]^{+} \mathrm{Cl}^{-}, \mathrm{Y}=1: 1$
D
$X=\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right]^{3+} 3 \mathrm{Cl}^{-}, \mathrm{Y}=1: 1$

Answer

Correct option: B.

$X=\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right]^{+} \mathrm{Cl},-\mathrm{Y}=1: 3$

(b) $\mathrm{X}=\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right]^{+} \mathrm{Cl}^{-}, \quad \mathrm{Y}=1: 3$

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MCQ 71 Mark

When $\ce{C_6H_5COOCOCH_2}$ is treated with $\ce{H_2O}$, the product obtained is:

A
Benzoic acid and ethanol
✓
Benzoic acid and ethanoic acid
C
Acetic Acid and phenol
D
Benzoic anhydride and methanol

Answer

Correct option: B.

Benzoic acid and ethanoic acid

$\ce{C_6H_5COOCOCH_3H_2OC_6H_5COOH + CH_3COOH}$

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MCQ 81 Mark

The initial concentration of $R$ in the reaction $R\rightarrow P$ is $4.62 \times 10^{-2} \ce{mol / L}$ What is the half life for the reaction if $k = 2.31 \times 10^{-2} \ce{mol L ^{-1}S^{-1}}$

A
$30 s$
B
$3 s$
C
$1 s$
✓
$10 s$

Answer

Correct option: D.

$10 s$

the order of reaction is zero as the unit of $k$ is $\ce{mol L}^{-1}s^{-1}.$
Thus half life $= [R]^\circ / 2k = 4.62 \times 10^{-2}/2 \times 2.31 \times 10^{-2}$

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MCQ 91 Mark

Study the graph showing the boiling points of bromoalkanes and identify the compounds.

A
1 = Bromomethane, 2= 2-Bromobutane, 3= 1-Bromobutane, 4= 2-Bromo-2-methylpropane
B
1=1-Bromobutane, 2= 2-Bromo-2-methylpropane, 3= 2-Bromobutane, 4= Bromomethane
C
1 = Bromomethane, 2=1-Bromobutane, 3= 2-Bromo-2-methylpropane, 4= 2-Bromobutane,
✓
1 =Bromomethane, 2= 2-Bromo-2-methylpropane, 3-2- Bromobutane, 4= 1-Bromobutane

Answer

Correct option: D.

1 =Bromomethane, 2= 2-Bromo-2-methylpropane, 3-2- Bromobutane, 4= 1-Bromobutane

(d) 1 =Bromomethane, 2= 2-Bromo-2-methylpropane, 3=2- Bromobutane, 4= 1-Bromobutane

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MCQ 101 Mark

Match the properties given in column $I$ with the metals in column $II$

Column $I$	Column $II$
$(1)$ Actinoid having configuration $(RN)5f^76d^17s^2 $	$(A) \ Ce$
$(2)$ Lanthanoid which has $4f^{14}$ electronic confi guration in $+3$ oxidation state.	$(B) \ Lu$
$(3)$ Lanthanoid which show $+4$ Oxidation state	$(C) \ Cm$

✓
$(1)-(C), (2)-(B), (3)-(A)$
B
$(1)-(C), (2)-(A), (3)-(B)$
C
$(1)-(A), (2)-(B), (3)-(C)$
D
$(1)-(B), (2)-(A), (3)-(C)$

Answer

Correct option: A.

$(1)-(C), (2)-(B), (3)-(A)$

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MCQ 111 Mark

Which one of the following has the highest dipole moment?

A
$\mathrm{CH}_3 \mathrm{~F}$
✓
$\mathrm{CH}_3 \mathrm{Cl}$
C
$\mathrm{CH}_3 \mathrm{I}$
D
$\mathrm{CH}_3 \mathrm{Br}$

Answer

Correct option: B.

$\mathrm{CH}_3 \mathrm{Cl}$

(b)CH3Cl
The order followed is this CH3I<CH3Br<CH3F< CH3Cl, though F is most electronegative, the bond length is small as compared to C-Cl. Dipole moment is the product of the charge and the bond length.

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MCQ 121 Mark

Ammonolysis of ethyl chloride followed by reaction of the amine so formed with 1 mole of methyl chloride gives an amine that

A
reacts with Hinsberg reagent to form a product soluble in an alkali.
B
on reaction with Nitrous acid, produced nitrogen gas.
✓
reacts with Benzenesulphonyl chloride to form a product that is insoluble in alkali.
D
does not react with Hinsberg reagent.

Answer

Correct option: C.

reacts with Benzenesulphonyl chloride to form a product that is insoluble in alkali.

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Chemistry M.C.Q (1 Marks)

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