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H3CC(H2)-Ph + Br2 (brown) ---> H3CC(H)(Br)-Ph + HBr (colorless gas) This reaction has radical nature, and is catalyzed by peroxides, such as benzoyl peroxide. It proceeds fast at 80°C, slower at RT. In general, alpha position of alkylarenes (the carbon that is next to aromatic ring) is quite succeptible to all kinds of reactions.

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Q: What causes the decolourization in the reaction mixture of ethylbenzene and bromine and dichloromethane?
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