What is the main component of $LPG$?

$CH_3-CH_2-CH_2-CH_3 \xrightarrow{Br_2/hv}$
Major product in the above reaction is

The number of possible enantiomeric pairs that can be produced during monochlorination of $2$-methylbutane is

What is the minimum number of carbon atoms required for an alkane to contain a quaternary carbon atom?

Explain the difference between an alkane and an alkyl group with an example.

Identify the correct statements from the following:
$(i)$ Petrol and $CNG$ operated automobiles cause less pollution.
$(ii)$ Alkanes having tertiary hydrogen can be oxidised to alcohols by $KMnO_4$.
$(iii)$ Methane can be prepared by Kolbe's electrolytic method.
$(iv)$ Alkyl chloride on reduction with zinc and dilute hydrochloric acid gives alkane.