The major product of the following reaction contains $.....$ bromine atom$(s)$.

Match the following reactions in List-$I$ with their products in List-$II$:

List-$I$	List-$II$
$A$. The reaction of $1,6$-dibromohexane with $Zn$.	$i$. $H_3C-C \equiv CH$
$B$. Reaction of ethanol with concentrated $H_2SO_4$ at $443 \ K$.	$ii$. $H_2C=CH_2$
$C$. Major product in the reaction of propene with $HBr$ in the presence of benzoyl peroxide.	$iii$. $CH_3-CH_2-CH_2-Br$
$D$. The reaction of $1,1$-dibromopropane with $NaNH_2$ at $433 \ K$.	$iv$. Cyclohexane

The decreasing order of heat evolved upon catalytic hydrogenation of the given reactants with $H_2\ (Pd/C)$ is:

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?

$CH_3-C(ONa)=CH_2$ $\xrightarrow{HC\equiv CH}$ $\xrightarrow{H^{+}}$ $\xrightarrow[Pd-BaSO_4]{H_2}$ $\xrightarrow[\Delta]{Al_2O_3}$
End product of the reaction is

What is the number of moles of $H$ atoms required for the complete reduction of one mole of acetonitrile?