Q. A given nitrogen containing aromatic compound A reacts with Sn/HCl, followed by $HNO_2$ to give an unstable compound B. B, on treatment with phenol, forms a beautiful coloured compound C with the molecular formula $C_{12}H_{10}N_2O$. The structure of the compound A is
A) [image:2016_Q85_opt_a.png]
B) [image:2016_Q85_opt_b.png]
C) [image:2016_Q85_opt_c.png]
D) [image:2016_Q85_opt_d.png]
Explanation
[Solution] Nitrobenzene is reduced by Sn/HCl to aniline, diazotised to benzenediazonium chloride (B), which couples with phenol to give p-hydroxyazobenzene ($C_{12}H_{10}N_2O$). A is nitrobenzene, structure (2). Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.