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Chlorine (Cl₂) and bromine (Br₂) are both halogens. They can react to form interhalogen compounds, such as bromine monochloride (BrCl), which is a reddish-brown liquid. This reaction is a simple halogenation, where a more electronegative halogen replaces another halogen in a molecule. The reaction can be visualized as a displacement reaction where the more reactive chlorine displaces bromine from a compound. For example:
Cl₂ + 2Br⁻ → 2Cl⁻ + Br₂