An aromatic organic compound [A] on heating with and at high pressure gives [B]. The compound [B]…

An aromatic organic compound [A] on heating with $\text{NH}_3$ and $\text{Cu}_2\text{O}$ at high pressure gives [B]. The compound [B] on treatment with ice cold solution of $\text{NaNO}_2$ and $\text{HCl}$ gives [C], which on heating with $\text{Cu}/\text{HCl}$ gives compound [A] again. Identify the compounds [A], [B] and [C]. Write the name of the reaction for the conversion of [B] to [C].