How many carbon atoms does an alkane (not a cycloalkane) need before it is capable of existing in an enantiomeric form?

In the reaction of $1$-bromo-$3$-chlorocyclobutane with two equivalents of sodium in ether,the major product is

What happens when methane reacts with concentrated $HNO_3$ at high temperature?

The reaction ${C_2H_5Cl} \xrightarrow{[H]} x$ produces $x$ as:

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.

$LPG$ is a mixture of