Question
Identify Hinsberg's reagent from following.
MHT CET
Chemistry
Amines
2026
MHT CET 2026 (15 April Shift 1)
MHT CET Chemistry Question (2026) — Solution
Options
- A. benzene sulfonic acid
- B. benzene sulphonyl chloride
- C. p-toluene sulphonyl chloride
- D. chlorosulphuric acid
Answer
B. benzene sulphonyl chloride
Step-by-step 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.
Related: Chemistry — Amines · All PYQ Banks