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Which of the following reactions is an example of disproportionation?

1. 2H2SO4 + Cu → CuSO4 + 2H2O + SO2
2. As2O3 + 3H2S → As2S3 + 3H2O
3. 2KOH + Cl2 → KCl + KClO + H2O
4. Ca3P2 + 6H2O → 3Ca(OH)2 + 2PH3

Correct answer: 2KOH + Cl2 → KCl + KClO + H2O

Solution

2KOH + Cl2 -> KCl + KClO + H2O has chlorine simultaneously reduced to -1 and oxidised to +1, the definition of disproportionation. The stored option (Ca3P2 + H2O) involves no oxidation-state change.

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