An internal alkyne(P) with formula ${\mathrm{C}}_4{\mathrm{H}}_6$ reacts with ${\mathrm{NaNH}}_2$ to form a sodium salt of terminal alkyne $\left(Q\right)$. $\left(Q\right)$ reacts with ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{Br}$ to form ($\mathrm{R}$). Reaction of $\left(\mathrm{R}\right)$ with excess $\mathrm{HCl}$ forms $\left(\mathrm{S}\right)$ Answer the following questions on the basis of above write up.
The structure of $\mathrm{P}$ is

The major product formed in the following reaction is

In the compound, 

$\underset{\left(\mathrm{I}\right)}{{\mathrm{CH}}_2}=\underset{\left(\mathrm{II}\right)}{\mathrm{CH}}-\mathrm{C}\underset{\left(\mathrm{III}\right)}{\equiv \mathrm{CH}}$

The most acidic hydrogen atom is

In the following reaction sequence



X and Y are, respectively

What will be the major product of following sequence of reactions?

The major product of the following reaction is

In the following sequence of reactions, the final product $\mathrm{D}$ is:

In the reaction


$\mathrm{x}$ and $\mathrm{y}$ , respectively, are

$\mathrm{A} \mathrm{is}$

Which among the following depicts the correct order of acidity?