When sodium propionate is heated with soda lime,the main product is

$(CH_3)_2CHBr$ $\xrightarrow[(2) CuI]{(1) Li} (A)$ $\xrightarrow{(CH_3)_2CHCH_2Br} B$.
$'B'$ is

Identify the product $X$ in the following reaction: $CH_3-CH_2-COONa \xrightarrow[\Delta]{\text{soda-lime}} X + Na_2CO_3$

The general formula of alkanes 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:

The smallest compound,which on photochlorination produces diastereomers is