The decreasing order of boiling points of the following alkanes is:
$(a)$ Heptane
$(b)$ Butane
$(c)$ $2-$methylbutane
$(d)$ $2-$methylpropane
$(e)$ Hexane
Choose the correct answer from the options given below:

Identify $X$ and $Y$ in the following reactions:
$CH_4 + O_2 \xrightarrow{Mo_2O_3 / \Delta} X$
$2CH_4 + O_2 \xrightarrow{Cu / 523 \ K / 100 \ atm} 2Y$

$n$-Propyl chloride reacts with sodium metal in dry ether to give:

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.

The number of monochloro-products formed from $n-$butane is:

Identify all the possible monochloro structural isomers expected to be formed on free radical monochlorination of $(CH_3)_2CHCH_2CH_3$.