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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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