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What does disproportionation reaction mean?
A reaction in which species undergo simultaneous oxidation and reduction.
Here is an example of a disproportionation reaction:
##3BrF → BrF_3 + Br_2##
Univalent bromine (in the interhalogen ##BrF##) is reduced to elemental bromine, and oxidized to ##Br^(III+)##.