In which case is the formation of $butanenitrile$ possible?

On monochlorination of $2-$methylbutane,the total number of chiral compounds is

Which reaction results in the formation of a pair of enantiomers?

What is the product $P$ obtained in the following reaction? $CH_3CH_2Br + AgCN_{(alc)} \rightarrow P$

Benzyl bromide on reaction with magnesium in the presence of dry ether gives $'X'$. $'X'$ on reaction with ethanol gives $'Y'$. Then the compound $Y$ is

Match List-$I$ with List-$II$.
$1$-Bromopropane is reacted with reagents in List-$I$ to give products in List-$II$.

List-$I$ (Reagent)	List-$II$ (Product)
$A$. $KOH$ (alc)	$I$. Nitrile
$B$. $KCN$ (alc)	$II$. Ester
$C$. $AgNO_2$	$III$. Alkene
$D$. $CH_3COOAg$	$IV$. Nitroalkane