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

2. H C C Br δ+ Br δ- H H H Polarised Electrophile

3. H C C Br δ + Br δ- H H H C C Br δ+ Br δ- H H H H __ + Curly arrows Carbocation

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

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

6. Mechanism Br δ HH C C Br HH __ + C C Br H H H H Br δ C C Br δ+ Br δ- H H H H C C Br H H H H __ +

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