Which molecule solid would have the highest melting point?

Ionic solids typically have the highest melting points among molecular solids due to the strong electrostatic forces between the charged ions. For example, sodium chloride (NaCl) has a significantly higher melting point than covalent molecular solids like sugar or wax. Additionally, larger ionic compounds with multiple charges, such as magnesium oxide (MgO), will generally exhibit even higher melting points due to the increased strength of their ionic bonds.