question_answer

The azo-dye among the following is:

A) alizarin                 

B)        indigo

C) malachite green

D)        martius yellow

E) orange-I

Correct Answer: E

Solution :

Azodye is orange-I. Azo dyes have benzene ring coupled through azo group\[[-N=N-]\]. e. g., methyl orange and congo red.