Question

Azo-dye test is given by:

• A. All amines
• B. Only primary amines
• C. Only primary aliphatic amines
• D. Only primary aromatic amines

Answer 1

The correct option is D

Only primary aromatic amines

Azo-dye test is given by only primary aromatic amines.

The azo products have extended conjugate system having both the aromatic rings joined by N=N bonds. Mostly such compounds are used in the manufacture of dyes, as this compounds are coloured in nature.For example benzene diazonium chloride reacts with phenol to give an orange dye i.e p-Hydroxyazobenzene.