Ethylene reacts with sulphur monochloride to form

An alkene $(X)$ on ozonolysis followed by reduction gives the following products: $H-CHO$ ($2$ moles), $H-CO-CHO$, and $CH_3-CO-CO-CH_3$. The alkene $(X)$ is:

An alkene $X$ on ozonolysis gives a mixture of $Propan-2-one$ and $methanal$. What is $X$?

What is the product $X$ in the following reaction?
$C_6H_5-CH_2-CH=CH_2 + HCl \rightarrow X$

Which of the following reactions results in the formation of a pair of diastereomers?

Which of the following is the most stable alkene?