Photochemical chlorination of an alkane is initiated by a process of

$n$-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:

The decreasing order of boiling points is

Which of the following compounds is $NOT$ formed by the reaction of $CH_4$ with $Cl_2$ in the presence of sunlight?

What is the minimum number of carbon atoms required to exhibit chirality in an alkane?

Explain why the boiling point and melting point of alkanes increase with an increase in molecular weight.