An organic compound ‘A’ contains nitrogen and chlorine. It dissolves readily in water to give a solution that turns litmus red. Titration of compound ‘A’ with standard base indicates that the molecular weight of ‘A’ is \(131 \pm 2\). When a sample of ‘A’ is treated with aq. \( \mathrm{NaOH} \), a liquid separate which contains \( \text{N} \) but not \( \text{Cl} \). Treatment of the obtained liquid with nitrous acid followed by phenol gives orange precipitate. The compound ‘A’ is:
