The compound which is $NOT$ formed when a mixture of $n$-butyl bromide and ethyl bromide is treated with sodium metal in the presence of dry ether is:

The products $(A)$ and $(B)$ respectively are:

$C_3H_7I$ $(P)$ $\xrightarrow[\text{alc. } KOH]{\Delta}$ $Q$ $\xrightarrow{NBS}$ $R$ $\xrightarrow{KCN}$ $CH_2 = CH - CH_2 - CN$. $P$ can be:

Which of the following undergoes hydrolysis most easily?

Identify the major products $(P)$ and $(Q)$ respectively for the given reaction.

What happens when
$(i)$ $n$-butyl chloride is treated with alcoholic $KOH$.
$(ii)$ bromobenzene is treated with $Mg$ in the presence of dry ether.
$(iii)$ chlorobenzene is subjected to hydrolysis.
$(iv)$ ethyl chloride is treated with aqueous $KOH$.
$(v)$ methyl bromide is treated with sodium in the presence of dry ether.
$(vi)$ methyl chloride is treated with $KCN$?