23
MCQ (Single Correct Answer)
Chloromethane on treatment with excess of ammonia yields mainly
A
N, N-dimethylmethanamine
B
N -methylmethanamine $\left(\mathrm{CH}_3-\mathrm{NH}-\mathrm{CH}_3\right)$
C
methanamine $\left(\mathrm{CH}_3 \mathrm{NH}_2\right)$
D
mixture containing all these in equal proportion
24
MCQ (Single Correct Answer)
Molecules whose mirror image is non-superimposable over them are known as chiral. Which of the following molecules is chiral in nature?
A
2-bromobutane
B
1-bromobutane
C
2-bromopropane
D
2-bromopropan-2-ol
25
MCQ (Single Correct Answer)
Reaction of $\mathrm{C}_6 \mathrm{H}_5 \mathrm{CH}_2 \mathrm{Br}$ with aqueous sodium hydroxide follows ........... .
A
$\mathrm{S}_{\mathrm{N}} 1$ mechanism
B
$\mathrm{S}_{\mathrm{N}} 2$ mechanism
C
Any of the above two depending upon the temperature of reaction
D
Saytzeff rule
26
MCQ (Single Correct Answer)
Which of the following compounds will give racemic mixture on nucleophilic substitution by $\mathrm{OH}^{-}$ion?
A
(i)
B
(i), (ii) and (iii)
C
(ii) and (iii)
D
(i) and (iii)
27
MCQ (Single Correct Answer)
Which of the carbon atoms present in the molecule given below are asymmetric?
A
1, 2, 3, 4
B
2, 3
C
1, 4
D
1, 2, 3