Question

The compound $X(C_7{H}_{9}N)$ reacts with benzene sulphonyl chloride to give $Y(C_{13}{H}_{13}N{O}_{2}S)$ which is insoluble in alkali. The compound $X$ is

• A.
• B.
• C.
• D.

Answer 1

Answer: (A)

Benzene sulphonyl chloride is also known as Hinsberg’s reagent, reacts with $1^{\circ }$ and $2^{\circ }$ amines to form sulphonamides.
The sulphonamide of $1^{\circ }$ amine is soluble in alkali whereas that of $2^{\circ }$ amine is insoluble in alkali.
Thus, the given compound $Y(C_7{H}_{9}N)$ is $2^{\circ }$ amine, among the options (a)

is a $2^{\circ }$ amine, which reacts with benzene sulphonyl chloride to give $Y(C_3{H}_{13}N{O}_{2}S)$, which is insoluble in alkali.