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 compound $A$ is
Solution:
Correct answer is (b)
