Which of the following best describes the behavior of bromine in the reaction given below?
$H_2O + Br_2 \to HOBr + HBr$

Which of the following acts as both an oxidizing and a reducing agent?

Assign $A, B, C, D$ from the given type of reaction.
$H_3PO_3 \xrightarrow{\Delta} H_3PO_4 + PH_3 \uparrow$

Which of the following compounds undergoes disproportionation in the presence of $SO_3$ gas?

Given below are two statements :
Statement $I$: $S_8$ solid undergoes disproportionation reaction under alkaline conditions to form $S^{2-}$ and $S_2O_3^{2-}$.
Statement $II$: $ClO_4^{-}$ can undergo disproportionation reaction under acidic condition.
In the light of the above statements,choose the most appropriate answer from the options given below :

Which of the following does not undergo a comproportionation reaction?