$A$ racemic mixture is obtained due to the halogenation of:

Propane molecule on chlorination under photochemical conditions gives two dichloro products,$x$ and $y$. Amongst $x$ and $y$,$x$ is an optically active molecule. How many trichloro products (consider only structural isomers) will be obtained from $x$ when it is further treated with chlorine under photochemical conditions?

Which of the following reactions is used to prepare hydrocarbons with an even number of carbon atoms?
$i.$ Wurtz reaction
$ii.$ Decarboxylation reaction
$iii.$ Kolbe's electrolysis
$iv.$ Reduction
$v.$ Hydrogenation

The most strained cycloalkane is

$2-$Methylbutane on reacting with bromine in the presence of sunlight gives mainly:

Number of cycloalkanes having the molecular formula $C_5H_{10}$?