The major product(s) formed in the following reaction sequence is(are):

$2, 3$-Dibromobutane $\frac{\begin{array}{c}\mathrm{i}) \mathrm{Zn}/\mathrm{Cu},\mathrm{\Delta }\\ \mathrm{ii}) {\mathrm{O}}_3\end{array}}{\mathrm{iii}) \mathrm{Zn}/{\mathrm{H}}_2\mathrm{O}} ?$

The major product of the following reaction is:

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

In the following reaction sequence

X and Y are

The major product of the following reaction is:

The major product in the following conversion is

What is the major product expected from the following reaction?



Where D is an isotope of hydrogen.