Answer: Option (2) is the correct answer.
Explanation:
Arrhenius acid are the species that donate a \(H^{+}\) ion or proton.
For example, \(HBr \rightarrow H^{+} + Br^{-}\)
Whereas LiF, \(Mg(OH)_{2}\), and \(CH_{3}CHO\) are the substances which do not give a proton upon dissociation. Hence, they are not Arrhenius acids.
Therefore, we can conclude that \(HBr(aq)\) substance is an Arrhenius acid.
