Question:
The diazonium salt of which of the following compounds will form a coloured dye on reaction with β-Naphthol in NaOH ?
The diazonium salt of which of the following compounds will form a coloured dye on reaction with β-Naphthol in NaOH ?
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The Dye Test is used to distinguish primary aromatic amines from aliphatic amines. Aliphatic diazonium salts are unstable and decompose immediately, failing to form the dye.
Updated On: Jan 21, 2026
- A
- B
- C
- D
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The Correct Option is A
Solution and Explanation
Step 1: Primary aromatic amines react with $NaNO_2 + HCl$ at $0-5^\circ C$ to form stable diazonium salts.
Step 2: When this salt is added to an alkaline solution of $\beta$-Naphthol, a coupling reaction occurs.
Step 3: The product is an azo dye (typically orange/red). Since all options are primary aromatic amines, Aniline is the most fundamental answer usually sought in competitive exams for this specific test.
Step 2: When this salt is added to an alkaline solution of $\beta$-Naphthol, a coupling reaction occurs.
Step 3: The product is an azo dye (typically orange/red). Since all options are primary aromatic amines, Aniline is the most fundamental answer usually sought in competitive exams for this specific test.
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