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

The product $(A)$ is:

The product $(A)$ of the reaction is:

In the given reaction,identify the final product.

Consider the following sequence of reactions to produce major product $(A)$. Molar mass of product $(A)$ is $........... \ g \ mol^{-1}$. (Given molar mass in $g \ mol^{-1}$ of $C : 12, H : 1, O : 16, Br : 80, N : 14, P : 31$)

Which of the following amines will not give $N_2$ gas on treatment with nitrous acid $(NaNO_2 + HCl)$?