Identify the set from the following sets in which all specices can exhibit disproportionation reaction.

The species which can undergo both oxidation and reduction exhibit disproportionation reactions, i.e., if the
central atom in the species which can show both increase and decrease in O.N. then it shows disproportionation reaction. Clearly it is not possible in options (2), (3), (4) as they all have ${\mathrm{ClO}}_4^{-}$ as common species, which is has Cl in +7 oxidation state.