# Which of the following reactions are disproportionation reaction?

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Which of the following reactions are disproportionation reaction?

(a) $2Cu^+ \to Cu^{2+} +Cu^0$

(b) $3MnO_4^{2-} + 4H^+ \to 2MnO_4^- + MnO_2 +2H_2O$

(c) $2KMnO_4 \xrightarrow{\Delta} K_2MnO_4+ MnO_2+O_2$

(d) $2MnO_4^-+ 3Mn^ {2+} +2H_2O \to 5MnO_2+ 4H^\oplus$

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
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Redox reactions, Types of redox reactions