How many of the following elements (or) ions (or) compounds will disproportionate in acidic (or) in basic medium at proper temperature

${\mathrm{P}}_4,{\mathrm{S}}_8,{\mathrm{F}}_2,{\mathrm{NO}}_2^{-},{\mathrm{ClO}}^{-},{\mathrm{MnO}}_4^{2^{-}},{\mathrm{H}}_3{\mathrm{PO}}_3,{\mathrm{Br}}_2$

${\mathrm{F}}_2$  do not disproportionate.

Disproportionation is a redox reaction in which one compound of intermediate oxidation state converts to two compounds, one of higher and one of lower oxidation states

So, to occur such type of redox reaction, the element should exist in at least three oxidation states. So that element present in the intermediate state and it can change to both higher and lower oxidation state during disproportionation reaction.

Fluorine is the most electronegative element and a strong oxidizing agent and is the smallest in size of all the halogens.

It does not show a positive oxidation state (shows only −1 oxidation state) and hence, does not undergo disproportionation reaction.