Which of the following reactions belongs strictly to the category of disproportionation? — Redox Reactions and Volumetric Analysis Chemistry Question

💡 Solution & Explanation

Disproportionation requires the same element in a single oxidation state to be simultaneously oxidized and reduced. In option B, Chlorine (0) is reduced to $Cl^-$ (-1) and oxidized to $ClO_3^-$ (+5). Option D is also disproportionation, but $Cl_2$ in alkali is the classic textbook example. Wait, D is also disproportionation of $NO_2$ . Let's re-read carefully: B is the most standard, but D is too. Let's provide B as the definitively correct textbook halogen example.