The reaction of propane with bromine in the presence of $UV$ light predominantly forms

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

Explain: Alkyl group.

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.

Which among the following has the lowest boiling point?

Which statement is not true concerning alkanes?