Photochemical chlorination of alkane is initiated by a process of

On mixing an alkane with chlorine and irradiating with ultra-violet light,it forms only one mono-chloro-alkane. The alkane is

Identify $A$ in the given chemical reaction.

Consider the isomers of the hydrocarbon with molecular formula $C_5H_{10}$. These isomers do not decolourise $KMnO_4$ solution. These isomers are subjected to chlorination with chlorine in the presence of light to give monochloro compounds. The total number of monochloro compounds (structural isomers only) formed from all these isomers is . . . . . . .

Paraffin wax is

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