How many grams of sodium $(atomic \ mass = 23 \ u)$ are required to prepare one mole of ethane from methyl chloride by the Wurtz reaction?

Identify $A$ in the given chemical reaction.

Give the mechanism of chlorination of methane.

Compound $A$ on reaction with chlorine in the presence of $U.V.$ light gives $B$; which when reacted with $NaNO_{2}$ in the solvent $N, N$-dimethylformamide $(DMF)$,gives $2$-nitrobutane. The compound $A$ is:

Identify the correct statements from the following:
$(i)$ Petrol and $CNG$ operated automobiles cause less pollution.
$(ii)$ Alkanes having tertiary hydrogen can be oxidised to alcohols by $KMnO_4$.
$(iii)$ Methane can be prepared by Kolbe's electrolytic method.
$(iv)$ Alkyl chloride on reduction with zinc and dilute hydrochloric acid gives alkane.

How many monochloro structural isomers are expected to be formed on free radical monochlorination of isopentane?