An aromatic compound "A" on treatment with $\mathrm{Zn} / \mathrm{NH}_4 \mathrm{Cl}$ and subsequent heating…
An aromatic compound "A" on treatment with $\mathrm{Zn} / \mathrm{NH}_4 \mathrm{Cl}$ and subsequent heating with ammonical silver nitrate solution gives a black precipitate. Which functional groups does "A" contain?