JEE Main · 2025 · 28 Jan 2025 · Shift 2 · Compounds Containing Nitrogen

Identify correct statements :
(A) Primary amines do not give diazonium salts when treated with

NaNO_{2}

in acidc condition.
(B) Aliphatic and aromatic primary amines on heating wth

CHCl_{3}

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 reacts with benzenesulfonyl chloride very easily.
Choose the correct answer from the options given below :

(A)(B) and (D) only✓ Correct
(B)(A) and (B) only
(C)(D) and (E) only
(D)(B) and (C) only

Answer: (A)

Solution

(A) is false: primary amines react with

N a N O_{2} / H C l

to form diazonium salts,

R - N H_{2} \to R - N_{2}^{+} C l^{-}

.

(B) is true: heating a primary amine, aliphatic or aromatic, with

C H C l_{3}

and ethanolic KOH gives the foul-smelling isocyanide — the carbylamine test, specific to primary amines.

(C) is false: secondary and tertiary amines lack the N-H needed to form an isocyanide, so they do not give this test.

(D) is true: benzenesulfonyl chloride,

C_{6} H_{5} S O_{2} C l

, is Hinsberg's reagent, used to distinguish

1°

2°

and

3°

amines.

(E) is false: tertiary amines have no N-H to react with, so they do not react readily with Hinsberg's reagent.

The correct statements are (B) and (D) only.

JEE Main · 2025 · 28 Jan 2025 · Shift 2 · Single correct option

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JEE Main · 2025 · 28 Jan 2025 · Shift 2 · Compounds Containing Nitrogen

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