Identify the product obtained when isopropyl bromide is reacted with metallic sodium in dry ether.

The alkane which is next to methane in the homologous series can be prepared from which of the following reactions?
$I$. $2 CH_3 Br \xrightarrow[\text{dry ether}]{Na}$
$II$. $CH_3 COOH \xrightarrow[CaO, \Delta]{NaOH}$
$III$. $CH_3 CH=CH_2 \xrightarrow{H_2 / Pt}$
$IV$. $CH_3 CH_2 Br \xrightarrow[H^{+}]{Zn}$
Correct answer is

The compound $(X)$ on $(i)$ heating in the presence of anhydrous $AlCl_3$ and $HCl$ gas gives $2,4$-dimethylpentane,$(ii)$ aromatization gives toluene,and $(iii)$ cyclisation gives methylcyclohexane. The correct name of compound $(X)$ is:

An alkane (mol. wt. = $86$) on bromination gives only two monobromo derivatives (excluding stereoisomers). The alkane is

Which of the following is not formed by the reaction of $Cl_2$ on $CH_4$ in sunlight?

The number of isomeric products formed by the monochlorination of $2$-methylbutane in the presence of sunlight is . . . . . . .