When a primary () amine reacts sequentially with Hinsberg's reagent (benzenesulphonyl chloride) followed by an excess of strong aqueous , what exact physical and chemical observation confirms its stru

Question

When a primary ($1^\circ$) amine reacts sequentially with Hinsberg's reagent (benzenesulphonyl chloride) followed by an excess of strong aqueous $KOH$, what exact physical and chemical observation confirms its structural class?

Prashant Kotian · Accepted Answer

Correct answer: C. A amine reacts with Hinsberg's reagent to yield an N-alkylbenzenesulphonamide. Crucially, the nitrogen retains one highly acidic hydrogen atom due to the strong electron-withdrawing adjacent group. This proton reacts instantly with to form a highly soluble ionic potassium salt, resulting in a clear solution.

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