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An example of a disproportionation reaction is :

1. 2NaBr + Cl 2 ⎯→ ⎯ 2NaCl + Br 2
2. 2KMnO 4 ⎯→ ⎯ 2KMnO 4 + MnO 2 + O 2
3. 2CuBr ⎯→ ⎯ CuBr 2 + Cu
4. − 4 MnO 2 + 10I – + 16H + ⎯→ ⎯ 2Mn 2+ + 5I 2 + 8H 2 O

Correct answer: 2CuBr ⎯→ ⎯ CuBr 2 + Cu

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