Identify the hydrocarbon compound from the following containing carbon atoms in the range of $C_{6}$ to $C_{8}$?

Prepare the following products from methane $(CH_4)$: $(i)$ Methyl chloride,$(ii)$ Carbon black,$(iii)$ Carbon dioxide,$(iv)$ Methanol,$(v)$ Methanal,$(vi)$ Carbon monoxide,$(vii)$ Dihydrogen,$(viii)$ Methyl iodide,$(ix)$ Methyl bromide.

Which of the following cannot be prepared using the Wurtz reaction?

$n$-Butane on monochlorination under photochemical conditions gives an optically active compound "$P$". "$P$" on further chlorination gives dichloro compounds. The number of dichloro compounds obtained (ignore stereoisomers) is:

Methane can be prepared by

In the process of cracking,what happens?