Write a note on the following reactions.
Chlorination of ethene

Explanation

When alkene is treated with halogens like chlorine or bromine addition takes place rapidly and forms `1`, `2`-dihalo alkane (or) vicinal dihalide.
`underset("ethene")(CH_(2)=CH_(2))underset(1,2"dichloroethane")(overset(Cl_(2))(to)overset(CH_(2))underset(Cl)(|)overset(CH_(2))underset(Cl)(|))`