Total number of alkali insoluble solid sulphonamides obtained by reaction of given amines with Hinsberg's reagent is
Aniline, N-Methylaniline, Methanamine, N,N-Dimethylmethanamine, N-Methyl methanamine, Phenylmethanamine, N-propylaniline, N-phenylaniline, N,N-Dimethylaniline, Allyl amine, Isopropyl amine
Aniline, N-Methylaniline, Methanamine, N,N-Dimethylmethanamine, N-Methyl methanamine, Phenylmethanamine, N-propylaniline, N-phenylaniline, N,N-Dimethylaniline, Allyl amine, Isopropyl amine
- (A)4✓ Correct
- (B)2
- (C)8
- (D)5
Answer: (A)
Solution
Benzenesulphonyl chloride (Hinsberg's reagent) reacts only with primary and secondary amines. The product from a primary amine keeps an acidic N-H and dissolves in alkali, whereas that from a secondary amine has no N-H and remains an alkali-insoluble solid, and tertiary amines do not react. The secondary amines in the list are N-methylaniline, N-methylmethanamine, N-propylaniline and N-phenylaniline, which give four alkali-insoluble solid sulphonamides.
JEE Main · 2026 · 28 Jan 2026 · Shift 2 · Single correct option