question_answer

Which of the following compounds on treatment first with \[NaN{{O}_{2}}/HCl\]and then coupled     with     phenol     produces \[p-\]hydroxyazobenzene?

A)  Nitrobenzene  

B)  Azobenzene

C)  Phenol        

D)  Aniline

Correct Answer: D

Solution :

 Key Idea: \[{{\text{1}}^{\text{o}}}\]aromatic amine on reaction with \[\text{NaN}{{\text{O}}_{\text{2}}}\text{/HCl}\]and phenol produce orange coloured dye which is p-hydroxy azobenzene. \[\therefore \]   is correct answer.