Which statements are correct for reagents A, B, C and D ?

The major product in the following conversion is

The major product of the following reaction is:

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

What is the major product expected from the following reaction?



Where D is an isotope of hydrogen.

The major product $\left[\mathrm{C}\right]$ of the following reaction sequence will be :

The major product in the following reaction is :