Which of the following is formed when propene is heated with chlorine at high temperature?

The olefin which on ozonolysis gives $CH_3CH_2CHO$ and $CH_3CHO$ is

Alkenes $(C=C)$ and carbonyl compounds $(C=O)$ both contain a $\pi$-bond,but alkenes show electrophilic addition reactions,whereas carbonyl compounds show nucleophilic addition reactions. Explain.

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

Alkenes usually show which type of reaction?

For the reaction $CH_3-CH=CH_2 + HOCl \to A$,the product $A$ is: