Question

Azo-dyes are prepared from :

• A. Aniline
• B. Salicylic acid
• C. Benzaldehyde
• D. Chlorobenzene

Answer 1

Answer: (A)

Aniline

Answer 2

When aniline is treated with $HNO_{2}$ at 0–5°C then diazonium salt is formed and by the coupling of diazonium salt and phenol azo dyes are prepared.