Due to differences in electronegativities of the hydrogen and bromine atom, HBr is a polar molecule
Example of an electrophilic addition reaction of HBr and propene to form 1-bromopropane and 2-bromopropane
Br2 is a non-polar molecule however when placed close to an area of high electron density it can get polarised
Example of an electrophilic addition reaction of Br2 and ethene to form dibromoethane
The stability of the carbocation intermediate is as follows:
tertiary > secondary > primary
When more than one carbocations can be formed, the major product of the reaction will be the one that results from the nucleophilic attack of the most stable carbocation.
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