Which of the following reactions are disproportionation reaction? a 2 C u + → C u 2 + + C u 0 b 3 M n O 4 2 - + 4 H + → 2 M n O 4 - + M n O 2 + 2 H 2 O c 2 K M n O 4 → ∆ K 2 M n O 4 + M n O 2 + O 2 d 2 M n O 4 - + 3 M n 2 + + 2 H 2 O → 5 M n O 2 + 4 H ⊕ Select the correct option from the following:

Step-by-step solution

The redox reactions in which the same species is getting oxidised (increase in oxidation number) and reduced (decrease in oxidation number). (i) 2 C u + ( + 1 ) → C u + 2 ( + 2 ) + C u 0 ( 0 ) → Disproportionation (ii) 3 M n O 4 2 - ( + 6 ) + 4 H + → 2 M n O 4 - ( + 7 ) + M n O 2 ( + 4 ) + 2 H 2 O → Disproportionation (iii) 2 K M n O 4 + 7 → Δ K 2 M n O 4 + 6 + M n O 2 + 4 + O 2 Only reduction is happening here. (iv) 2 M n O 4 - + 7 + 3 M n + 2 + 2 → 5 M n O 2 + 4 Different