Question

Hinsberg’s method to separate amines is based on the use of ______.

Options

• benzene sulphonyl chloride

• benzene sulphonic acid

• ethyl oxalate

• acetyl chloride

Answer 1

Hinsberg’s method to separate amines is based on the use of benzene sulphonyl chloride.

Explanation:

Hinsberg’s reagent is benzenesulfonyl chloride. In the test, primary amines react with it to give N‑benzene­sulfonamides that form soluble salts in alkali, secondary amines give insoluble sulfonamides, and tertiary amines do not (or react very slowly), so the three classes can be distinguished.