Discussion
Which of the following is Hinsberg's reagent?
Answer: C
Hinsberg's reagent is benzenesulphonyl chloride.
C6H5SO2Cl distinguishes primary, secondary and tertiary amines: primary amines give a sulphonamide soluble in alkali, secondary amines give one insoluble in alkali, and tertiary amines do not react.
Nitrous acid is also used to test amines but is not Hinsberg's reagent, 2,4-dinitrophenylhydrazine tests for carbonyl groups, ammoniacal silver nitrate is Tollens' reagent for aldehydes, and ethanolic KOH is used for dehydrohalogenation.
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