The melting point of alkynes are slightly lower than those of corresponding alkanes and alkenes.

Which among the following depicts the correct order of acidity?

The correct sequence of reagents for the following conversion will be

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

The major product in the following reactions is

${\mathrm{C}}_6{\mathrm{H}}_5-\mathrm{C}\equiv \mathrm{CH}\underset{\left(\mathrm{ii}\right)\mathrm{HI}\left(1\mathrm{eq}\right)}{\overset{\left(\mathrm{i}\right)\mathrm{HCl}\left(1\mathrm{eq}\right)}{\to }}$

In the reaction


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