The amine on reaction with benzene sulphonyl chloride (Heisenberg reagent) produces a compound insoluble in alkali. It indicates the amine is a amine. i.e. all options are possible except option (b) which is a amine . As this amine can be prepared by ammonolysis of ethyl chloride, the -amine should have at least one ethyl group. (a) does not have ethyl group. (c) does not have ethyl group. (d) has one ethyl group. So, option (d) is the correct answer. Preparation by ammonolysisof