In the following reaction sequence, the compounds $\left(\mathrm{X}\right)$ and $\left(\mathrm{Y}\right)$ respectively are:

In the above process product $\mathrm{A}$ is

Consider the following sequence of reactions.

$\mathrm{D}$ is

(major product) $\mathrm{X}$ will be:

(Major product) $\mathrm{X}$ will be:

$\mathrm{X}$ is: