After the first deprotonation of maleic acid, an intramolecular hydrogen bond can form in the hydrogen maleate ion (HC4H2O4) but it cannot form in the case of fumaric acid deprotonation. Draw the structures of both deprotonated isomers and explain how the difference in cis and trans arrangements allow the single-deprotonated form of maleic acid to form a hydrogen bond with itself but fumaric acid cannot form a similar hydrogen bond when it has lost just one of its two acidic protons