Consider the above chemical reaction. The total number of stereoisomers possible for product $'P'$ is $.....$

$Ph-CH=C(CH_3)_2 \xleftarrow{HBr} A$ and $Ph-CH=C(CH_3)_2 \xrightarrow[\text{Peroxide}]{HBr} B$. Identify $A$ and $B$.

$CH_3-CH=CH-CH=CH_2 \xrightarrow[Zn]{O_3 / H_2O}$ Which will not form?

An alkene $A$ on reaction with $O_{3}$ and $Zn-H_{2}O$ gives propanone and ethanal in equimolar ratio. Addition of $HCl$ to alkene $A$ gives $B$ as the major product. The structure of product $B$ is:

Predict the major product formed when $HCl$ is added to $2-$methylprop$-1-$ene $(isobutylene)$. Explain the mechanism involved.

The energy profile diagram for the dehydration of $2-$butanol using concentrated $H_2SO_4$ is given below. The product $(b)$ of the above reaction is: