Electrophilic addition of bromine

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Hi! I am stuck in revising the electrophilic addition of bromine across the alkene molecule... There are two sentences which really confuse me, I hope you can help me.

When a bromine molecule approaches the pi electron cloud of the C=C bond.......the bromide ion then attacks the pi complex nucleophilically from a side opposite to the first bromine. This becomes known as a trans attack and the result is a dibromo product.

My question is why the bromide ion have to attach to the pi complex from a different side and not the same side so that leads to the cis attack?

Thanks in advance! :smile:
 

GCT

Science Advisor
Homework Helper
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Due to steric effects, you'll want to observe the electron density of this reaction.
 

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