Which is the correct order for the heat of hydrogenation? 

$A$ and $B$ are:

The products of the following $\mathrm{I}$ and $\mathrm{II}$ sequence are related as

Consider the following reactions: 

The correct set of reagents for these reactions are:

Consider the following two reaction sequences 

The two products ($P$) and ($Q$) are respectively:

The correct reactivity order of the following$\mathrm{C}=\mathrm{C} / \mathrm{C}\equiv \mathrm{C}$ bonds towards ${\mathrm{Br}}^{\oplus }$ is: