Which of the following compounds would have the lowest melting point? . a. sodium chloride. b. sucrose. c. potassium chloride. d. aluminum oxide

Sucrose. Sucrose is made of all nonmetals, the others appear to be ionic bonds, while sucrose bonds covalently, since it's a carbon compound. Nonmetals tend to have lower melting points than metals, so potassium, aluminum and sodium compounds automatically have a higher melting point than any nonmetal compound.