Which major product is formed when excess of methane is treated with chlorine in the presence of $UV$ light?

Which of the following is a correct reaction?

Identify the product obtained in the following reaction:
$n CH_3 MgI + n H_2 O \xrightarrow{\text{dry ether}} \text{product}$

$100 \ mL$ of $0.1 \ M$ acetic acid is completely neutralized using a standard solution of $NaOH$. The volume of ethane obtained at $STP$ after the complete electrolysis of the resulting solution is (in $mL$)

An unknown compound $X$ on chlorination followed by Wurtz reaction and dehydrohalogenation gives ethene. Provide the complete reaction sequence in a stepwise manner.

Carbon black,which is used in making printer's ink,is obtained by decomposition of