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Which of the following reactions are disproportionation reactions? (A) Cu + → Cu 2+ + Cu (B) 2 4 3MnO − + 4H + → 2MnO 4 – + MnO 2 + 2H 2 O (C) 3KMnO 4 → K 2 MnO 4 + MnO 2 + O 2 (D) 2MnO 4 – + 3Mn 2+ + 2H 2 O → 5MnO 2 + 4H + Choose the correct answer from the options given below.

1. (B), (C), (D)
2. (A), (D)
3. (A), (B)
4. (A), (B), (C)

Correct answer: (A), (B)

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