Question

Identify correct statements: (A) Primary amines do not give diazonium salts when treated with \({NaNO}_2\) in acidic condition.
(B) Aliphatic and aromatic primary amines on heating with \({CHCl}_3\) 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 react with benzenesulfonyl chloride very easily.
Choose the correct answer from the options given below:

• (D) and (E) only
• (B) and (D) only
• (A) and (B) only
• (B) and (C) only

Hint:

- The carbylamine test is specific for primary amines. - Hinsberg’s test differentiates primary, secondary, and tertiary amines based on their reaction with benzenesulfonyl chloride.

Answer 1

The Correct Option is B

To identify the correct statements from the options given, let's analyze each one:

(A) Primary amines do not give diazonium salts when treated with \({NaNO}_2\) in acidic condition.
This statement is incorrect. Primary aromatic amines react with sodium nitrite \(({NaNO}_2)\) in acidic conditions to form diazonium salts. Therefore, this statement is false.

(B) Aliphatic and aromatic primary amines on heating with \({CHCl}_3\) and ethanolic \({KOH}\) form carbylamines.
This statement is correct. The reaction mentioned is the carbylamine reaction (or isocyanide test), which is a test for primary amines, especially aliphatic and aromatic ones.

(C) Secondary and tertiary amines also give carbylamine test.
This statement is incorrect. Only primary amines respond to the carbylamine test to form isocyanides; secondary and tertiary amines do not give this reaction.

(D) Benzenesulfonyl chloride is known as Hinsberg’s reagent.
This statement is correct. Benzenesulfonyl chloride is used in the Hinsberg test to distinguish between primary, secondary, and tertiary amines.

(E) Tertiary amines react with benzenesulfonyl chloride very easily.
This statement is incorrect. Tertiary amines do not react with benzenesulfonyl chloride under mild conditions like primary and secondary amines do.

Based on this analysis, the correct statements are:

(B) and (D) only

Answer 2

Step 1: Analyze each statement.

(A) Primary amines do not give diazonium salts when treated with \( NaNO_2 \) in acidic condition.
→ This statement is incorrect because **aromatic primary amines** (like aniline) do form diazonium salts under these conditions, while aliphatic ones form unstable diazonium compounds that decompose to alcohols.

(B) Aliphatic and aromatic primary amines on heating with \( CHCl_3 \) and ethanolic \( KOH \) form carbylamines.
→ This statement is correct. This is the carbylamine reaction (or isocyanide test), which is used to identify primary amines (both aliphatic and aromatic).

(C) Secondary and tertiary amines also give carbylamine test.
→ This statement is incorrect. Only primary amines give the carbylamine test; secondary and tertiary amines do not react.

(D) Benzenesulfonyl chloride is known as Hinsberg’s reagent.
→ This statement is correct. Benzenesulfonyl chloride is indeed Hinsberg’s reagent, used to distinguish primary, secondary, and tertiary amines.

(E) Tertiary amines react with benzenesulfonyl chloride very easily.
→ This statement is incorrect. Tertiary amines do not react with benzenesulfonyl chloride because they lack an N–H bond required for the reaction.

Step 2: Final answer.
The correct statements are:
\[ \boxed{(B) \text{ and } (D) \text{ only}} \]