Which of the Following Represents a Disproportionation Reaction

Multiple Choice

Which of the following represents a disproportionation reaction?

A) 2 Cu⁺(aq) + H₂O(l) → Cu(s) + CuO(s) + 2 H⁺(aq)
B) 2 CrO₄^2-(aq) + 2 H⁺(aq) → Cr₂O₇^2-(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)