An aromatic compound ' $\mathrm{A}$ ' on heating with $\mathrm{Br}_2$ and $\mathrm{KOH}$ forms a compound ' $\mathrm{B}$ ' of molecular formula $\mathrm{C}_6\mathrm{H}_7\mathrm{N}$ which on reacting with $\mathrm{CHCl}_3$ and alcoholic $\mathrm{KOH}$ produces a foul smelling compound ' $\mathrm{C}$ '. Write the structure and IUPAC names of compound A, B and C.