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Which one of the following is an example of disproportionation reaction?

1. – 2 4 3MnO + 4H + → – 4 2MnO + MnO 2 + 2H 2 O
2. – 4 MnO + 4H + + 4e – → MnO 2 + 2H 2 O
3. 10I – + – 4 2MnO + 16H – → 2 Mn 2+ + 8H 2 O + 5l 2
4. – 4 8MnO + – 2 3 2 O 3S + H 2 O → 8MnO 2 + – 2 4 6SO + 2OH –

Correct answer: – 2 4 3MnO + 4H + → – 4 2MnO + MnO 2 + 2H 2 O

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