The electrophilic addition reaction of chlorine Cl2 with ethene C2H4 involves the following steps:1. Formation of the electrophile: Chlorine molecule Cl2 is a non-polar molecule, but it can be polarized by the electron-rich double bond of ethene. The polarization of the chlorine molecule leads to the formation of a positively charged chlorine electrophile Cl+ and a negatively charged chlorine anion Cl- .Cl2 Cl+ + Cl-2. Attack of the electrophile on the double bond: The positively charged chlorine electrophile Cl+ attacks the electron-rich double bond of ethene C2H4 . This results in the formation of a carbocation intermediate and the breaking of the double bond.C2H4 + Cl+ [C2H4Cl]+3. Capture of the carbocation by the nucleophile: The negatively charged chlorine anion Cl- formed in the first step acts as a nucleophile and attacks the carbocation intermediate, forming a new bond with the positively charged carbon atom.[C2H4Cl]+ + Cl- C2H4Cl2The major product formed in this reaction is 1,2-dichloroethane C2H4Cl2 , which is an alkyl halide. The reaction mechanism can be visualized as follows: Cl2 |C=C + Cl-Cl Cl-C-C-Cl | | H H H H