Wurtz reaction is $NOT$ possible with which of the following alkyl halides?

Identify product $P$ in the following reaction: $C_2H_5MgBr + NH_3 \rightarrow P$

Match the column and find the correct answer:

Column-$I$	Column-$II$
$i$. $n$-Butane $\to 2$-methylpropane	$A$. Free radical substitution
$ii$. $CH_4 + Cl_2 \xrightarrow{hv} CH_3Cl + HCl$	$B$. Wurtz reaction
$iii$. $R-COONa \xrightarrow{\text{soda-lime}} R-H$	$C$. Isomerism
$iv$. $R-X + Na \xrightarrow{\text{Ether}} R-R$	$D$. Decarboxylation

For the reaction of $2-$methylbutane with $Cl_2$ in the presence of $hv$,let $N$ be the total number of isomeric monochlorinated products (including stereoisomers). If these products are separated by fractional distillation,let $M$ be the number of fractions obtained. Find the values of $N$ and $M$.

Methane can be prepared by:

Photochemical chlorination of an alkane is initiated by a process of