Question

Which of the following reactions are disproportionation reactions?
$\text{(A) } \text{Cu}^+ \rightarrow \text{Cu}^{2+} + \text{Cu}$
$\text{(B) } 3\text{MnO}_4^{2-} + 4\text{H}^+ \rightarrow 2\text{MnO}_4^- + \text{MnO}_2 + 2\text{H}_2\text{O}$
$\text{(C) } 2\text{KMnO}_4 \rightarrow \text{K}_2\text{MnO}_4 + \text{MnO}_2 + \text{O}_2$
$\text{(D) } 2\text{MnO}_4^- + 3\text{Mn}^{2+} + 2\text{H}_2\text{O} \rightarrow 5\text{MnO}_2 + 4\text{H}^+$
Choose the correct answer from the options given below.

• A. (A), (B)
• B. (B), (C), (D)
• C. (A), (B), (C)
• D. (A), (D)

Answer 1

Answer: (A)

(A), (B)

Answer 2

Disproportionation reactions involve a single substance undergoing both oxidation and reduction. Reaction (A) and (B) satisfy this condition.