. . . . "an aldehyde + oxygen + H2O = a carboxylate + hydrogen peroxide + H+"^^ . "an aldehyde + oxygen + H₂O = a carboxylate + hydrogen peroxide + H⁺"^^ . "1.2.3.1"^^ . . . . . . . . . . . . . "an aldehyde + oxygen + H2O = a carboxylate + hydrogen peroxide + H+"^^ . . .