Chemistry · PYQ NEET UG 2019(1)

Which of the following reactions are disproportionation reactions?\n(a) \( 2\text{Cu}^+ \longrightarrow \text{Cu}^{2+} + \text{Cu}^0 \)\n(b) \( 3\text{MnO}_4^{2-} + 4\text{H}^+ \longrightarrow 2\text{MnO}_4^- + \text{MnO}_2 + 2\text{H}_2\text{O} \)\n(c) \( 2\text{KMnO}_4 \xrightarrow{\Delta} \text{K}_2\text{MnO}_4 + \text{MnO}_2 + \text{O}_2 \)\n(d) \( 2\text{MnO}_4^- + 3\text{Mn}^{2+} + 2\text{H}_2\text{O} \longrightarrow 5\text{MnO}_2 + 4\text{H}^+ \)

1. A
   \( \text{(a), (b) and (c)} \)
2. B
   \( \text{(a), (c) and (d)} \)
3. C
   \( \text{(a) and (d) only} \)
4. D
   \( \text{(a) and (b) only} \)