Which among the following species doesn't show disproportionation reaction?

Step-by-step solution

We know that the species which undergoes oxidation as well as reduction during the chemical reaction then that reaction is called disproportionation reaction. In ClO 4 - , the oxidation state of Cl atom is + 7 which is the maxium oxidation state in which chlorine atom can exist, so it can just go to the lower oxidation state during the chemical reaction i.e. ClO 4 - can only undergo reduction and acts as only oxidising agent. Thus, ClO 4 - does not undergo the oxidation that's why it can't show disproportio