Question

Nucleophilic attack by bromine?

Answer 1

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$the \: \: \pi \: electrons \: \: act \: as \: nucleophille,$
attacking the bromine ion but forming a cationic cyclic bromonium ion as an intermediate .

Step 2: Attack of the nucleophilic water molecule from the side away from the bromonium center opens the cyclic bromonium ion to give overall trans addition.

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Answer 2

The nucleophiles attack the carbon to which bromine is attached.This bcarbon is called an electrophilic center.This bromine atom is called the leaving group.
In nucleophilic substitution
CH3Br+KCN-------------->C2H5CN+KBr.
In electrophilic addition
CH2=CH2+HBr--------CH3-CH2Br