Which of the following reactions are disproportionation reactions? — Redox Reactions and Volumetric Analysis Chemistry Question

💡 Solution & Explanation

Disproportionation occurs when the same element is simultaneously oxidized and reduced. In A, $Cu^+$ (+1) splits into $Cu^{2+}$ (+2) and $Cu$ (0). In B, $MnO_4^{2-}$ (+6) splits into $MnO_4^-$ (+7) and $MnO_2$ (+4). Reaction C is decomposition, and reaction D is comproportionation.