2-methyl propene is isomeric with butene-1. They can be distinguished by

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.