Complete combustion of $CH_4$ gives

What is $Z$ in the following reaction?
$CH_3-CH_2-CO_2^{\ominus} Na^{\oplus} \stackrel{NaOH / CaO}{\longrightarrow} Z$

How do you account for the formation of ethane during the chlorination of methane?

$CH_3-CH(CH_3)-CH_2-CH_3 \xrightarrow{Cl_2/h\nu} N$ (number of isomers) $\xrightarrow{\text{Fractional distillation}} (F)$. Find $N$ and $F$.

Which of the following alkanes cannot be prepared by the hydrogenation of an olefin?

Which of the following is $NOT$ obtained when a mixture of methyl bromide and ethyl bromide is treated with sodium metal in the presence of dry ether?