What is the range of the number of carbon atoms in alkanes found in paraffin wax?

$CH_3COOH$ $\xrightarrow{\text{Sodalime}} (A)$ $\xrightarrow{Br_2 / hv} (B)$ $\xrightarrow[KOH]{\text{Aq.}} (C)$ is $:-$

Marsh gas mainly contains .........

The reaction $CH_2 = CH_2 + H_2 \xrightarrow[250 - 300^{\circ}C]{Ni} CH_3 - CH_3$ is called:

Weight $(g)$ of two moles of the organic compound,which is obtained by heating sodium ethanoate with sodium hydroxide in the presence of calcium oxide is:

Identify the major product $Y$ in the following reaction sequence:
$CH_3-CH(CH_3)-CH_2-Cl$ $\xrightarrow[\text{dry ether}]{Na} X$ $\xrightarrow[\text{monobromination}]{Br_2/h\nu} Y$ (major)