MHT CET 2026 Chemistry question

Identify Hinsberg's reagent from following.

(A)benzene sulphonic acid
(B)benzene sulphonyl chlorideCorrect
(C)p-toluene sulphonyl chloride
(D)chlorosulphuric acid

Answer: (B)

Solution

Hinsberg's reagent is benzenesulphonyl chloride, , used to distinguish and separate primary, secondary and tertiary amines. A primary amine gives N-alkylbenzenesulphonamide, which has an acidic hydrogen on nitrogen and dissolves in aqueous KOH; a secondary amine gives an N,N-dialkylbenzenesulphonamide

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Question ID VK-098648