Definition of Halohydrin Formation

In the reaction of halohydrin​ formation, ​ the π-bond is allowed to break so that halohydrin can be formed in its place. The halohydrin formation reaction takes place in the presence of water. The halogen is attacked by the π-bond and the bond breaks consequently.


The lone pair of the halogen atom then attacks the carbon and forms a halogen bridge. The second halogen becomes a negative halide and is surrounded by water molecules. The halide bridge is broken by the water molecule and water attacks the more substituted carbon in this way. The product formed is halohydrin. 

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