Which of the following alkyl-substituted alkenes is the most stable?

In the reaction,$H_2C = CH_2 \xrightarrow{\text{cold alkaline } KMnO_4} (A)$. Product $A$ is :

What is the product formed when glycerol reacts with excess $HI$?

Which of the products will be the major product in the reaction given below?
$CH_3CH=CH_2 + HI \to CH_3CH_2CH_2I_{(A)} + CH_3CHICH_{3(B)}$

Explain the reactivity of alkenes.

The reaction of propene with $HOCl$ proceeds via the addition of which of the following in the first step?