The bond between the carbon and the bromine then undergoes heterolytic fission , with the bromine atom taking the donated electron and becoming the bromide ion ( Br − ) , because a SN2 reaction occurs by backside attack .
The bond between the carbon and the bromine then undergoes heterolytic fission , with the bromine atom taking the donated electron and becoming the bromide ion ( Br − ) . This is a SN2 reaction occurs by backside attack .