Concepts and reasonThe addition of halogens in plain temperature, in the absence of exposure come UV irradiate to yield vicinal dihalides.
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FundamentalsGeneral device of the halogenation reaction:-
Step 1As the halogen molecules
Step 2The nucleophilic attack by the halide ion developed in step 1 top top the halonium ion indigenous the next opposite to that of the bulky halogen part causes the opening of the three-member ring and also the development of the vicinal dihalides.
Heterolytic cleavage the
Explanation:As the chlorine molecules strategy the π-electrons the the alkene, they space polarized. Then, the chlorine molecules experience a heterolytic cleavage and react with an alkene to kind cyclic halonium ion and chloride ion.
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Explanation:The nucleophilic attack by the chloride ion created in action 1 ~ above the halonium ion indigenous the next opposite to that of the bulky chlorine section causes the opened of the three-membered ring and the development of vicinal dihalide. The enhancement is trans under this conditions.