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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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