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- Bromine molecules approach the electron-rich double bond
- The electrons in the double bond repel those in the bromine-bromine bond, polarising it
and making the bromine electrophilic
- As the C-Br bond forms the p-bond in the double bond weakens,
as does the s-bond between the bromine atoms
- The carbocation formed is attacked rapidly by the bromide ion to form the final product
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