Illustrated Glossary of Organic Chemistry

Disproportionation reaction: A redox reaction in which a reactant is converted into products by simultaneous oxidation and reduction reactions.

Hg2Cl2

Hg   +   HgCl2
In this disproportionation reaction, ultraviolet irradiation () of Hg2Cl2, a Hg(I) salt, produces Hg(0) (a reduction product) and HgCl2, a Hg(II) salt (an oxidation product).