Which of these chemical equations describes a disproportionation reaction? A) 2C₂H₆(g) + 7O₂(g) → 4CO₂(g) + 6H₂O(l) B) 2KBr(aq) + Cl₂(g) → 2KCl(aq) + Br₂(l) C) 2H₂O₂(aq) → 2H₂O(l) + O₂(g) D) CaBr₂(aq) + H₂SO₄(aq) → CaSO₄(s) + 2HBr(g) E) 2Al(s) + 3H₂SO₄(aq) → Al₂(SO₄)₃(aq) + 3H₂(g)

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In a disproportionation reaction, the same substance is both reduced and oxidized. In choice C, the hydrogen peroxide (H2O2) is being oxidized to oxygen gas (O2) and reduced to water (H2O), making it a disproportionation reaction. The other choices do not involve the same substance being both reduced and oxidized.

Which of These Chemical Equations Describes a Disproportionation Reaction