disproportionation of Br₂ in excess OH⁻ to Br⁻ and BrO₃⁻.
Br₂ + OH⁻ → Br⁻ , BrO₃⁻ + H2O
A halogen (X₂) disproportionates in the base in several steps to X⁻ and XO₃⁻.X₂ → X⁻ , XO₃⁻,
One chemical of intermediate oxidation state transforms into two compounds, one of higher and one of lower oxidation levels, in a redox reaction known as disproportionation, sometimes known as dismutation. More broadly, the word can be used to describe any desymmetrizing reaction of the form 2 A A' + A", regardless of whether it belongs to the redox family of processes or not.
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