Question

MnO₂^-4 undergoes disproportionation reaction in acidic medium but MnO₄^- does not. Give reason.

Answer 1

In MnO₄, Mn is in the highest oxidation state of +7 I hence it cannot undergo disproportionation. In trast in MnO₂, the O.N. of Mn is +6. Therefore, it can increase its O.N. to +7 or decrease its O.N to some er value. Thus, it undergoes disproportionation in lic medium as;