The reaction of ${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{C}\mathrm{H}=\mathrm{C}\mathrm{H}\mathrm{C}{\mathrm{H}}_3$ with $\mathrm{HBr}$ produces

In the following reaction sequence

X and Y are

The major product in the following conversion is

In the given reaction, the product $\mathrm{P}$ is

The major product of the following reaction is:

What is the major product expected from the following reaction?



Where D is an isotope of hydrogen.

The major product of the following reaction is: