A type of chemical reaction in which the same compound is simultaneously reduced and oxidized. For example, copper(I) chloride disproportionates thus:2CuCl → Cu+CuCl2The reaction involves oxidation of one molecule CuI → CuII+eand reduction of the other CuI+e → CuThe reaction of halogens with hydroxide ions is another example of a disproportionation reaction, for example Cl2(g)+2OH−(aq) ⇌ Cl−(aq)+ClO−(aq)+H2O(l)The reverse process is comproportionation.
2CuCl → Cu+CuCl2
CuI → CuII+e
CuI+e → Cu
Cl2(g)+2OH−(aq) ⇌ Cl−(aq)+ClO−(aq)+H2O(l)