Which one of the following is an example of disproportionation reaction?

Question

Canvas Classes · Accepted Answer

Disproportionation = same element simultaneously oxidised and reduced in the same reaction.

Step 1 — Check option (1):

- Mn in :  (reactant)
- Mn in :  → oxidised
- Mn in :  → reduced
- Same element (Mn) both oxidised and reduced → Disproportionation ✓

Step 2 — Eliminate others:
- (2): Half-reaction only (reduction only) ✗
- (3):  oxidised,  reduced — two different elements ✗ (not disproportionation)
- (4):  oxidised,  reduced — two different elements ✗

Answer: Option (1)

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