An organic compound A has molecular formula C7H9 N and it forms a clear solution when dissolved in aqueous KOH solution of benzene sulphonyl chloride. A on treatment with NaNO2 and HCI at 0oC and then with 2-naphthol forms an intensely coloured compound. Also A on treatment with CH3COCl followed by electrophilic substitution yields a single product. Identify A.