Which of the following expressions for the degree of dissociation of a monoacidic base (BOH) in aqueous solution at appreciable concentration is not correct?
1) BOH ⇌ B+ + OH⁻
2) BOH ⇌ BH⁺ + OH⁻
3) BOH ⇌ B+ + H₂O
4) BOH ⇌ BH⁺ + OH⁻ + H₂O