[] A given nitrogen-containing aromatic compound A reacts with Sn/HCl, followed by HNO2 to g

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A given nitrogen-containing aromatic compound A reacts with Sn/HCl, followed by HNO₂ to give an unstable compound B. B, on treatment with phenol, forms a beautiful coloured compound C with the molecular formula C₁₂H₁₀N₂O. The structure of compound A is

Explanation:
reaction result C12H10N2O

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