Effect of Nature of Nucleophile on addition to a,b-unsaturated compounds

Halohydrin Formation | Electrophilic addition to alkenes | Reaction Mech...

Reaction of alkene with halogen, when carried out in the presence of water, leads to the formation of halohydrin. 

performing the reaction in an alcohol will yield an ether. 

Bromination of alkenes | Electrophilic addition to alkenes | Reaction Me...

Halogenation is an example of electrophilic aromatic substitution reaction. It is the addition of a halogen molecule across the C=C. 

Addition to alkenes | Introduction to Electrophilic addition to alkenes