Q44 / 150 · MHT CET 2026 (15 April Shift 1) · Chemistry

Identify Hinsberg's reagent from following.

  • A
    benzene sulfonic acid
  • Correct answer
    B
    benzene sulphonyl chloride
  • C
    p-toluene sulphonyl chloride
  • D
    chlorosulphuric acid

Solution

Hinsberg's reagent is benzene sulphonyl chloride ($C_6H_5SO_2Cl$).

It is used to distinguish between primary, secondary, and tertiary amines.

Primary amines react with it to form a precipitate that is soluble in alkali.

Secondary amines react to form a precipitate that is insoluble in alkali.

Tertiary amines do not react with it.

Hence, the correct answer is option: 'B'.

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