Allyl chloride on dehydrochlorination gives:

An unknown alkene $(A)$ reacts with $3 \ mole$ of $H_2$ gas in the presence of a platinum catalyst to form $1$-isopropyl-$4$-methylcyclohexane. When the unknown alkene $(A)$ is ozonized and reduced,the following products are obtained:
$HCHO$,$OHC-CH_2-CO-CO-CH_3$,and $CH_3-CO-CH_2-CHO$
What is the structure of alkene $(A)$?

The final product $'C'$ is?

$CH_3-CH=CH-CH_3 \xrightarrow[R_2O_2, \Delta]{HBr} \text{ (Anti-Markownikoff's addition)}$
Comment on the optical activity of the products.

Alkene $(A)$ will be:
$\mathop A\limits_{(\text{alkene})} \xrightarrow{RCO_3H, H_2O} \text{Racemic mixture}$
$\mathop A\limits_{(\text{alkene})} \xrightarrow{\text{Cold dil. } KMnO_4} \text{Meso-compound}$

What is $X$ in this reaction?