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MHT CET202620 April 2026Evening ShiftChemistryAminesActual

Identify the reagent used to distinguish primary and secondary amines by Hinsberg test.

Options

  1. ANaNO ₂ and HCl
  2. BFeCl ₃ (alc)
  3. CC ₆ H ₅ SO ₂ Cl
  4. DCHCl ₃ and KOH (alc)

Correct answer

C. C ₆ H ₅ SO ₂ Cl

Step-by-step solution

Hinsberg test is used to distinguish between primary, secondary, and tertiary amines. The reagent used in this test is benzenesulfonyl chloride, which has the chemical formula C ₆ H ₅ SO ₂ Cl . Primary amines react with Hinsberg reagent to form an N-alkylbenzenesulfonamide, which is soluble in alkali due to the presence of an acidic hydrogen attached to nitrogen. Secondary amines react to form an N,N-dialkylbenzenesulfonamide, which is insoluble in alkali as it lacks an acidic hydrogen. Tertiary amines do not react

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