Consider the given reaction. The total number of oxygen atoms present per molecule of the product $(P)$ is . . . . . .

Predict the major product $A$ for the following reaction:
$2\text{-methylbuta-1,3-diene} + HBr (1 \text{ eq.}) \xrightarrow{-80^{\circ}C (1,2\text{-addition})} A$

The product $(A)$ is:

What is the difference in reaction of alkene with $HBr$ in the presence of peroxide and in the absence of peroxide?

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

Addition of $OsO_4$ to cyclopentene would give a product which is