$C_2H_5Br$ $\xrightarrow{AgCN} X$ $\xrightarrow{\text{Reduction}} Y$. Here $Y$ is

What are $X$ and $Y$ respectively in the following reactions?

When alkyl halide is boiled with a large excess of alcoholic ammonia,it forms:

An organic compound $A$ on treatment with $NH_3$ gives $B$,which on heating gives $C$. $C$ when treated with $Br_2$ in the presence of $KOH$ produces ethyl amine. Compound $A$ is:

Identify product $B$ in the following reaction: $CH_3Br + AgNO_2$ $\longrightarrow A$ $\xrightarrow{Sn / HCl} B$

$Cl-CH_2-COONa$ on boiling with aqueous sodium nitrite gives: