Ethyl isocyanide on hydrolysis in an acidic medium generates

The reaction of a given compound with ${\mathrm{NaNO}}_2$ and $\mathrm{HCl}$ forms $\mathrm{X}$ as the major product. What is true about $\mathrm{X}$?

What is the product $\mathrm{C}$ obtained in the following sequence of reactions?

What is the major product obtained when ${\mathrm{Br}}_2/\mathrm{Fe}$ is treated with the given compound?

In the above reactions:
$\left(\mathrm{a}\right)$ $\mathrm{X}$ and $\mathrm{Y}$ are isomers.
$\left(\mathrm{b}\right)$ $\mathrm{X}$ and $\mathrm{Y}$ are $1°$ amines.
$\left(\mathrm{c}\right)$$\mathrm{X}$ and $\mathrm{Y}$ are homologous.
$\left(\mathrm{d}\right)$ $\mathrm{Y}$ is the bromo derivative of $\mathrm{X}$.

The correct statements are:

Predict the possible number of alkenes and the main alkene in the above reaction.

$\mathbf{X}\mathbf{ }\underset{{\mathbf{s}}_{\mathbf{N}}\mathbf{2}}{\overset{{\mathbf{PhCH}}_{\mathbf{2}}{\mathbf{CH}}_{\mathbf{2}}\mathbf{Br}}{\mathbf{\to }}}\mathbf{ }\mathbf{Y}\stackrel{{\mathrm{OH}}^{-}}{⟶}\mathbf{Z}\stackrel{\mathrm{\Delta }}{⟶}\underset{\mathrm{Major} \mathrm{product}}{\mathbf{A}+\mathbf{B}}$

Which of the following is true if $\mathrm{A}$ is a nitrogen containing compound?