Which of the following amines cannot be prepared by the Gabriel phthalimide synthesis method?

In the Gabriel phthalimide synthesis,phthalimide is treated first with

Phthalimide is made to undergo the following sequence of reactions. Total number of $\pi$ bonds present in product '$P$' is/are:

What are $X$ and $Y$ in the following reactions?
$X \xrightarrow[(ii) H_2O]{(i) LiAlH_4} R CH_2 NH_2 \xleftarrow{H_2 / Ni} Y$

The compound $A$ when treated with $HNO_3$ (in presence of $H_2SO_4$) gives compound $B$,which is then reduced with $Sn$ and $HCl$ to aniline. The compound $A$ is

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