A given nitrogen-containing compound A reacts with `Sn//HCI` followed by `HNO_(2)` to give an unstable compund `B.B` on treatment with pheno1 forms a beautiful coloured compound `C` with the molecular formula `C_(12)H_(10)N_(2)O` The structure of compound `A` is .

A given nitrogen-containing compound A reacts with Sn//HCl followed by HNO_(2) to give an unstable compund B.B on treatment with phenol forms a beautiful coloured compound C with the molecular formula C_(12)H_(10)N_(2)O The structure of compound A is . (a) (b) (c) (d)

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_12H_10N_2O . The structure of compound 'A' is