Consider the change in oxidation state of Bromine corresponding to different emf values, as shown in the diagram below:

Then, what is the species undergoing disproportionation?

• A

  $\text{B}{\text{r}}_2$
• Correct answer
  B

  $\text{HBr}\text{O}$
• C

  $\text{Br}{\text{O}}_4^{-}$
• D

  $\text{Br}{\text{O}}_3^{-}$

Hence, the correct answer is option: 'B'.