An amine on reaction with benzenesulphonyl chloride produces a compound insoluble in alkaline solution. This amine can be prepared by ammonolysis of ethyl chloride. The correct structure of amine is :
1
CH3CH2CH2NHCH3
2
\(\rm \begin{matrix}\rm \ \ \ H\\\ \rm CH_3CH_2CH_2N-CH_2CH_3\end{matrix} \)
3
4
CH3CH2NH2