The alkane that gives only one mono-chloro product on chlorination with $Cl_2$ in the presence of diffused sunlight is:

$Methane$ can be converted into $ethane$ by the reactions

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 . . . . . . .

The angle strain in cyclopropane is:

Which reagent will be used in the following process?
$CH_3-CH_2-CH_2-CH_3 \rightarrow CH_3-CH_2-CH_2-CH_2-Cl + CH_3-CH_2-CHCl-CH_3$

Complete the following reactions:
$(1)$ $CH_3CH_2CH_2CH_2Cl + H_2 \xrightarrow{Zn, H^{+}}$
$(2)$ $CH_3CH_2CH_2CH_3 \xrightarrow[HCl, \Delta]{Anhy. AlCl_3}$