Question 59: Which of the following reactions will NOT give primary amine as the product?
Answer: Option (1)
Explanation:
In Option (1), \mathrm{CH_3NC} is an isocyanide.
Reduction of isocyanides with \mathrm{LiAlH_4} followed
by hydrolysis gives secondary amines.
Thus, \mathrm{CH_3NC} on reduction forms dimethylamine,
which is a secondary amine, not a primary amine.
In Option (2), reduction of amide \mathrm{CH_3CONH_2} with \mathrm{LiAlH_4} gives ethylamine, which is a primary amine.
In Option (3), \mathrm{CH_3CONH_2} undergoes Hofmann bromamide reaction with \mathrm{Br_2/KOH} to form methylamine, a primary amine.
In Option (4), reduction of nitrile \mathrm{CH_3CN}
with \mathrm{LiAlH_4} followed by hydrolysis gives ethylamine,
which is a primary amine.
Therefore, the reaction that does NOT give a primary amine is Option (1).