Question: which among the following does not show disproportionation reaction?
Answer: ClO4-1 (perchlorate ion) cannot show any disproportionation reaction. The oxidation state of Cl is ClO4- ion is +7. It is the maximum oxidation state which it can have. ... It can decrease the same by undergoing reduction and not increase it anymore hence ClO4- ion does not undergo disproportionation reactions.