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The reaction of NaBr (sodium bromide) with Cl2 (chlorine gas) is a single displacement reaction. Chlorine is more reactive than bromine, so it will displace bromine from the compound. The products of the reaction are NaCl (sodium chloride) and Br2 (bromine). Here's the balanced chemical equation:
2 NaBr + Cl2 → 2 NaCl + Br2