$A$ hydrocarbon reacts with hypochlorous acid to give $1-$chloro$-2-$hydroxyethane. The hydrocarbon is

The product $(s)$ of the following reaction can best be described as

Explain the reactivity of alkenes towards electrophilic reagents.

Compound$(s)$ that on hydrogenation produce$(s)$ optically inactive compound$(s)$ is (are)

The alkene that will give the same product with $HBr$ in the absence as well as in the presence of peroxide is

Compound $X$ on reaction with $O_{3}$ followed by $Zn/H_{2}O$ gives formaldehyde and $2-$methylpropanal as products. The compound $X$ is :