Question:
(i) The reaction in which an amide is converted into a primary amine by the action of Br2 and alcoholic NaOH is known as ________.
(ii) How is a primary amine distinguished from a secondary amine using the Hinsberg test?
(i) The reaction in which an amide is converted into a primary amine by the action of Br2 and alcoholic NaOH is known as ________.
(ii) How is a primary amine distinguished from a secondary amine using the Hinsberg test?
(ii) How is a primary amine distinguished from a secondary amine using the Hinsberg test?
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In Hoffmann Bromamide Degradation, the resulting amine always has one carbon atom less than the starting amide!
Updated On: Mar 11, 2026
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The Correct Option is A
Solution and Explanation
Step 1: Hinsberg Test Principle.
Amines react with benzenesulphonyl chloride (C6H5SO2Cl).
Primary Amines:
They form N-alkylbenzenesulphonamide. The hydrogen attached to nitrogen is strongly acidic due to the electron-withdrawing sulphonyl group, making the compound soluble in alkali.
Secondary Amines:
They form N,N-dialkylbenzenesulphonamide. There is no acidic hydrogen on the nitrogen, so the compound remains insoluble in alkali.
Amines react with benzenesulphonyl chloride (C6H5SO2Cl).
Primary Amines:
They form N-alkylbenzenesulphonamide. The hydrogen attached to nitrogen is strongly acidic due to the electron-withdrawing sulphonyl group, making the compound soluble in alkali.
Secondary Amines:
They form N,N-dialkylbenzenesulphonamide. There is no acidic hydrogen on the nitrogen, so the compound remains insoluble in alkali.
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