NEET 2018 Chemistry Disproportionation Reactions MCQ Question

Consider the change in oxidation state of bromine corresponding to different emf values as shown in the diagram below: BrO₃⁻ $\overset{1.82 \text{ V}}{\longrightarrow}$ BrO₂⁻ $\overset{1.5 \text{ V}}{\longrightarrow}$ HBrO $\overset{1.595 \text{ V}}{\longrightarrow}$ Br₂ $\overset{1.0652 \text{ V}}{\longrightarrow}$ Br⁻ Then the species undergoing disproportionation is __________.