( I ) F2 shows disproportionation reactions( II )  F2 is the weakest oxidising agent and it is always reduced.

Disproportionation is a specific type of redox reaction in which a species is simultaneously reduced and oxidized to form two different products.As fluorine shows an oxidation of only  -1 and has a tendency to reduce, it doesn't undergo disproportionation reaction.Fluorine gas is the strongest oxidizing agent because of these factors:-