The process in which higher hydrocarbons are broken down into lower hydrocarbons by controlled pyrolysis is called:

The compound with molecular formula $C_{20}H_{42}$ is

Assertion $(A)$: Cyclohexane is the most stable cycloalkane.
Reason $(R)$: Cyclopropane and cyclobutane are less stable due to angle strain and torsional strain.
The correct answer is

Only two isomers of monochloro product are possible for which of the following?

Identify the product obtained when isopropyl bromide is reacted with metallic sodium in dry ether.

Pure methane can be produced by: