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Which of the given reactions is not an example of disproportionation reaction?

1. 2H 2 O 2 → 2H 2 O + O 2
2. 2NO 2 + H 2 O → HNO 3 + HNO 2
3. − 4 MnO + H + + 3e – → MnO 2 + 2H 2 O
4. − 2 4 MnO + 4H + → 2 − 4 MnO + MnO 2 + 2H 2 O

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

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