In the dichlorination reaction of propane,a mixture of products is obtained. How many isomers does the mixture contain?

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:

Give the reaction for the formation of $n$-butane from ethane.

For complete combustion of $10 \ L$ of alkane,the volume of oxygen required is $50 \ L$. Identify the alkane.

Identify $X$ and $Y$ in the following reactions:
$CH_4 + O_2 \xrightarrow{Mo_2O_3 / \Delta} X$
$2CH_4 + O_2 \xrightarrow{Cu / 523 \ K / 100 \ atm} 2Y$

Dry distillation of sodium propanoate with sodalime gives