question_answer

A compound with nitro group was reduced by  \[\text{Sn/HCl,}\]followed by treatment with \[\text{NaN}{{\text{O}}_{\text{2}}}\text{/HCl}\]and followed by phenol. The chromophore group in the final compound is

A) \[\text{N}{{\text{O}}_{2}}\] group      

B) \[\text{ }\!\!~\!\!\text{ N}{{\text{H}}_{\text{2}}}\] group .

C)  azo group      

D)  OH group

Correct Answer: C

Solution :

 The chromophore group in the final compound is azo group\[(-N=N-)\]