Which of the following represents a disproportionation reaction?
A) 2 Cu+(aq) + H2O(l) → Cu(s) + CuO(s) + 2 H+(aq)
B) 2 CrO42-(aq) + 2 H+(aq) → Cr2O72-(aq) + H2O(aq)
C) TiCl4(l) + 2 H2O(l) → TiO2(s) + 4 HCl(g)
D) MnO4-(aq) + 5 VO2+(aq) + H2O(l) → Mn2+(aq) + 5 VO2+(aq) + 2 H+(aq)
E) 3MnO2(s) + 6 KOH(aq) + KClO3(aq) 3 K2MnO4(aq) + KCl(aq) + 3 H2O(l)
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