The action of nitrous acid with ethylamine produces:

Product $(B)$ of this reaction is

The reaction of ethylamine and acetic anhydride leads to the formation of:

Which of the following compounds reacts with $HNO_2$ to form an alcohol?

Arrange the following in the increasing order of their basic strengths: $CH_{3}NH_{2}$,$(CH_{3})_{2}NH$,$(CH_{3})_{3}N$,$NH_{3}$.

The compound $X$ $(C_7H_9N)$ reacts with benzenesulfonyl chloride to give $Y$ $(C_{13}H_{13}NO_2S)$ which is insoluble in alkali. The compound $X$ is