Identify the total number of carbon atoms present in undecane.

Isobutyl magnesium bromide with dry ether and absolute alcohol gives

Which of the following will give two isomeric monochloro derivatives?

Identify the major product $Y$ in the following reaction sequence:
$CH_3-CH(CH_3)-CH_2-Cl$ $\xrightarrow[\text{dry ether}]{Na} X$ $\xrightarrow[\text{monobromination}]{Br_2/h\nu} Y$ (major)

Arrange the following in decreasing order of their boiling points:
$(A)$ $2-$Methylbutane
$(B)$ $2,2-$Dimethylpropane
$(C)$ Pentane
$(D)$ Hexane

Complete the following reactions:
$(i)$ Liberation of dihydrogen gas from methane.
(ii) Oxidation of $2$-methylpropane.