Identify correct statements: (A) Primary amines do not give diazonium salts when treated with NaNO2 in acidic…
Amines · Class 12 · JEE Main Previous Year Question
Identify correct statements:
(A) Primary amines do not give diazonium salts when treated with in acidic condition. (B) Aliphatic and aromatic primary amines on heating with and ethanolic KOH form carbylamines. (C) Secondary and tertiary amines also give carbylamine test. (D) Benzenesulfonyl chloride is known as Hinsberg's reagent. (E) Tertiary amines react with benzenesulfonyl chloride very easily.
(a) (B) and (D) only (b) (A) and (D) only (c) (D) and (E) only (d) (B) and (C) only
- a✓
(B) and (D) only
- b
(A) and (D) only
- c
(D) and (E) only
- d
(B) and (C) only
(B) and (D) only
Evaluating each statement:
- (A) Primary amines DO give diazonium salts with /HCl (aromatic: stable at 0–5°C; aliphatic: unstable but formed). → ❌ WRONG
- (B) Primary amines (aliphatic + aromatic) + + KOH(EtOH) → carbylamines (isocyanides). Carbylamine test is specific to primary amines. → ✅ CORRECT
- (C) Only primary amines give carbylamine test. Secondary and tertiary do not. → ❌ WRONG
- (D) (benzenesulfonyl chloride) = Hinsberg's reagent. → ✅ CORRECT
- (E) Tertiary amines have no N–H bond → do NOT react with Hinsberg's reagent. → ❌ WRONG
Correct: B and D → Answer: (a)
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