An aromatic compound $\text{'}\mathrm{A}\text{'}$ having molecular formula ${\mathrm{C}}_7{\mathrm{H}}_6{\mathrm{O}}_2$ on treating with aqueous ammonia and heating forms compounds $\text{'}\mathrm{B}\text{'}$. The compound $\mathrm{B}$ on reaction with molecular bromine and potassium hydroxide provides compound $\text{'}\mathrm{C}\text{'}$ having molecular formula ${\mathrm{C}}_6{\mathrm{H}}_7\mathrm{N}$. The structure of $\text{'}\mathrm{A}\text{'}$ is: