Consider the reaction of water with `F_(2)` and suggest, in terms of oxidation and reduction, which species are oxidised/reduced.

Explanation

`underset("Oxidant")(2F_2(g)) + underset("Reductant")(2H_2 O(l)) to O_2 (g) + 4H^(+)(aq) + 4F^(-) (aq)`
or `underset("oxidant")(3F_2(g)) + underset("Reductant")(3H_2O)(l) to O_3(g) + 6H^(+) (aq) + 6F^(-) (aq)`
Water acts as a reducing agent and gets oxidised to `O_2` or `O_3`.
`F_2` acts as an oxidising agent and itself gets reduced to `F^-`