Consider the following substances

$1.$ $\mathrm{C}{\mathrm{H}}_3\mathrm{C}\equiv \mathrm{C}\mathrm{C}{\mathrm{H}}_3$

$2.$ $\mathrm{C}{\mathrm{H}}_3\mathrm{C}{\mathrm{H}}_2\mathrm{C}\equiv \mathrm{C}\mathrm{H}$

$3.$ $\mathrm{C}{\mathrm{H}}_3\mathrm{C}\mathrm{H}=\mathrm{C}\mathrm{H}\mathrm{C}{\mathrm{H}}_3$

$4.$ $\mathrm{C}{\mathrm{H}}_3\mathrm{C}{\mathrm{H}}_2\mathrm{C}\mathrm{H}=\mathrm{C}{\mathrm{H}}_2$

Which of the following reagent can be used to distinguish the compound (2) from the rest of the compounds?

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

The major product in the following reactions is

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

Which among the following depicts the correct order of acidity?

The correct sequence of reagents for the following conversion will be

The major product of the following reaction is

In the reaction


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

Match List$-\mathrm{I}$ with List$-\mathrm{II}:$

Choose the most appropriate match