Addition of $HCl$ to propene in the presence of peroxides gives:

How many propenyl radicals are possible from propene?

The number of $sp^3$ hybridized carbon atoms in cyclohexene is

Following are the four molecules $P$,$Q$,$R$ and $S$. Which one among the four molecules will react with $HBr_{(aq)}$ at the fastest rate?

In the following sequence of reactions,the alkene affords the compound $B$.
$CH_3-CH=CH-CH_3$ $\xrightarrow{O_3} A$ $\xrightarrow[Zn]{H_2O} B$
The compound $B$ is:

The major product of the following reaction is $:$