The Arrhenius definition has numerous shortcomings that cannot entirely explain acid/base behavior, including in the case of dimethylamine being a basic molecule. Select all that apply.
1) The Arrhenius definition does not explain why molecular compounds can act as acids or bases.
2) The Arrhenius definition is specific to only the aqueous phase.
3) The Arrhenius definition does not explain the existence of H₃O⁺(aq) ions.
4) The Arrhenius definition requires dissociation of an acid to produce H₃O⁺(aq) ions.
5) The Arrhenius definition requires a base to possess a lone pair of electrons.