In the above reaction, the reagent "$A$" is :

The product "$\mathrm{P}$" in the above reaction is :

The major product of the following reaction is:

The major product formed in the following reaction is:

Compound $\mathrm{\prime }\mathrm{x}\mathrm{\prime }$ is:

Acid strength given below the correct decreasing order will be :

The major product of the following reaction is,