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Classic question. And although many things would, you're probably wanting the answer "alkenes".


This is because alkenes are unsaturated. They have a C=C double bond. Electrons just waiting to be taken.
Bromine is a halogen. It's dying to get just one more electron to fill its octet, so Br2 will attack the C=C and take some electrons in the form of a covalent bond.


Example:


H2C=CH2 + Br2 ---> H2BrC-CBrH2


Now each carbon has 4 bonds and Bromine has filled its octet. All's good.

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15y ago

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