Explain the following observations:
(i) Aniline dissolves in aqueous HCl.
(ii) The amino group in ethylamine is basic whereas that in acetamide it is not basic.
(iii) Dimethylamine is a stronger base than trimethylamine.
(iv) Sulphanilic acid although has acidic as well as basic group, it is soluble in alkali but insoluble in mineral acids.
