Discussion

Choose the correct combinations for the column I with column II.

Column-I	Column-II
(a) Benzenesulphonyl chloride	(i) Carbylamine reaction
(b) Conversion of amide to amine	(ii) Secondary amine
(c) Conversion of primary amine to isocyanide	(iii) Hinsberg’s reagent
(d) Diethylamine	(iv) Hofmann’s bromamide reaction

Answer: C

The correct combination is (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii).

(a) Benzenesulphonyl chloride is Hinsberg's reagent, used to tell primary, secondary and tertiary amines apart.
(b) An amide is converted to an amine with one carbon fewer by Hofmann's bromamide reaction (Br₂ and NaOH).
(c) A primary amine heated with chloroform and alcoholic KOH gives a foul-smelling isocyanide: the carbylamine reaction.
(d) Diethylamine, (C₂H₅)₂NH, has two alkyl groups on nitrogen, so it is a secondary amine.

The option with (c)-(ii) and (d)-(i) swaps the last two pairs, and the others misplace Hinsberg's reagent.

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