An amine reacts with benzenesulfonyl chloride and the product is insoluble in aqueous KOH. The amine is

Aethylamine
Baniline
CN-methylaniline
Dbenzylamine

Answer: C

A secondary amine forms a sulfonamide with no N-H left (it has no acidic hydrogen), so it does not dissolve in alkali. Primary amines (aniline, benzylamine, ethylamine) give sulfonamides with an acidic N-H that dissolve in KOH as the sodium salt.

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