If the heat of hydrogenation of $1$-butene is $30 \ kcal$,what is the heat of hydrogenation of $1,3$-butadiene (in $kcal$)?

The hydrocarbon $(X)$ with molar mass $80 \ g \ mol^{-1}$ and $90 \%$ carbon has $............$ degree of unsaturation.

Which one of the following is the intermediate in the preparation of a ketone by hydration of an alkyne in the presence of sulfuric acid and mercury $(II)$ sulphate?

What are $X$ and $Y$ respectively in the following sets of reactions?
$I. \ CH_3CH_2CH_2OH \xrightarrow{PBr_3} X$
$II. \ CH_3CH=CH_2 \xrightarrow{HBr, (C_6H_5COO)_2} Y \text{ (major)}$

The product of the reaction shown is:

The number of sigma $(σ)$ and pi $(π)$ bonds in pent$-2-$en$-4-$yne is