Question

The species given below that does $NOT$ show disproportionation reaction is:

• A. $Br{O}_3^{-}$
• B. $Br{O}^{-}$
• C. $Br{O}_2^{-}$
• D. $Br{O}_4^{-}$

Answer 1

The correct option is D $Br{O}_4^{-}$

A reaction in which atoms of same element is simultaneously oxidised as well as reduced is called a disproportionation reaction. In $Br{O}_4^{-},$ Br is in the highest oxidation state of $+7$, so it cannot oxidise further. Hence, it cannot show disproportionation reaction.