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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