Electrophilic addition. Ethene and bromine liquid at room temperature.
H C C Br δ+ Br δ- H H H Polarised Electrophile
H C C Br δ + Br δ- H H H C C Br δ+ Br δ- H H H H __ + Curly arrows Carbocation
H C C Br δ+ H H H C C Br Br δ- H H H H __ + + Bromide ion
C C Br H H H H 1,2-dibromoethane
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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