An organic compound ' A ' on reaction with $\mathrm{NH}_3$ followed by heating gives compound B . Which on further strong heating gives compound $\mathrm{C}\left(\mathrm{C}_8 \mathrm{H}_5 \mathrm{NO}_2\right)$. Compound C on sequential reaction with ethanolic KOH , alkyl chloride and hydrolysis with alkali gives a primary amine. The compound A is :