Magnesium oxide (MgO) is an ionic compound that exhibits the following properties:

A. High melting point: MgO has a high melting point (2800°C) due to the strong ionic bonds between magnesium and oxygen ions.

B. Dissolution in polar solvents: MgO is soluble in polar solvents like water, which is due to the ability of water molecules to interact with the ions.

C. Presence of ionic bonds: MgO is an ionic compound, meaning it is held together by ionic bonds between magnesium cations (Mg²⁺) and oxygen anions (O²⁻).

D. Possession of crystal lattice: MgO has a crystal lattice structure, which is typical of ionic compounds.

E. Low binding energy: MgO has a high binding energy due to the strong ionic bonds between the magnesium and oxygen ions. This high binding energy is responsible for its high melting point. Hence, option E is the correct answer because MgO does not have a low binding energy.