1. Electrophilic addition.
Ethene and bromine liquid at room temperature.

2. H H C C H H
Electrophile
Polarised
Brδ+
Brδ-

3. H H H H C C C C H H H H Brδ+ Brδ- Brδ- Carbocation Br δ+ Curly arrows__
Curly arrows

4. H H H H H C C H H C C H + + Br
Brδ+
Brδ- __
Bromide ion
Brδ- __

5. H H H C C H Br Br
1,2-dibromoethane

6. Brδ C
Brδ+
Brδ- H Br __ +
Mechanism
Brδ H C Br __ +

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