An aromatic compound ' $A$ ' of molecular formula $\mathrm{C_7H_7ON}$ undergoes a series of reactions as shown below. Write the structures of A, B, C, D and E in the following reactions: OR(a) Write the structures of main products when aniline reacts with the following reagents:(i) $\mathrm{Br}_2$ /water(ii) $\mathrm{HCl}$(iii) $\mathrm{(CH_3CO)_2O}/$ pyridine(b) Arrange the following in the increasing order of their boiling point:$\mathrm{C_2H_5NH_2}, \mathrm{C_2H_5OH}, \mathrm{(CH_3)_3N}$(c) Give a simple chemical test to distinguish between the following pair of compounds:$\mathrm{(CH_3)_2NH}$ and $\mathrm{(CH_3)_3N}$