Which of the following reactions are disproportionation reaction
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Which of the following reactions are disproportionation reaction?
(a) 2Cu⁺ → Cu²⁺ + Cu⁰
(b) 3MnO₄²⁻ + 4H⁺ → 2MnO₄⁻ + MnO₂ + 2H₂O
(c) 2KMnO₄ --∆→K₂MnO₄ + MnO₂ + O₂
(d) 2MnO₄⁻ + 3Mn²⁺ + 2H₂0 → 5Mn0₂ + 4H⊕
Select the correct option from the following :
(1) (a) and (b) only
(2) (a), (b) and (c)
(3) (a), (c) and (d)
(4) (a) and (d) only