Which of the following compounds is least soluble in water at $STP$?

Compared to the chlorination of alkanes,bromination is.......

$A$ compound $A$ contains $C$ and $H$ only and has a molecular mass of $72$. Its photochlorination gives a mixture containing only one monochloro and two dichloro hydrocarbons. What is its $IUPAC$ name?

The compound $(X)$ on $(i)$ heating in the presence of anhydrous $AlCl_3$ and $HCl$ gas gives $2,4$-dimethylpentane, $(ii)$ aromatization gives toluene, and $(iii)$ cyclisation gives methylcyclohexane. The correct name of compound $(X)$ is:

Which of the following is not formed by the reaction of $Cl_2$ on $CH_4$ in sunlight?

Formation of alkane by the action of $Zn$ on alkyl halide is called