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Question
Reaction of bromine with an alkene is an example of:
Reaction of bromine with an alkene is an example of:
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Solution
The correct option is B electrophilic addition
The reaction is an example of electrophilic addition.
The bromine is a very "polarisable" molecule and the approaching pi bond in the ethene induces a dipole in the bromine molecule.
In the first stage of the reaction, one of the bromine atoms becomes attached to both carbon atoms, with the positive charge being found on the bromine atom.
A bromonium ion is formed.
The bromonium ion is then attacked from the back by a bromide ion formed in a nearby reaction.
Option B is correct.
The reaction is an example of electrophilic addition.
The bromine is a very "polarisable" molecule and the approaching pi bond in the ethene induces a dipole in the bromine molecule.
In the first stage of the reaction, one of the bromine atoms becomes attached to both carbon atoms, with the positive charge being found on the bromine atom.
A bromonium ion is formed.
The bromonium ion is then attacked from the back by a bromide ion formed in a nearby reaction.
Option B is correct.
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