Fatty acid molecules contain a long carbon chain with a carboxylic acid group. Fatty acids have a polar end (the carboxylic acid group) and a nonpolar end (the carbon chain). The nonpolar carbon chain causes fatty acids to be insoluble in water. Fatty acids can be saturated (contain only single bonds between carbon atoms) or unsaturated (contain at least one carbon-carbon double bond). Unsaturated fatty acids can occur as cis-trans isomers. In general, the melting point of a saturated fatty acid increases with the length of the carbon chain. Unsaturated fatty acids typically have a lower melting point than saturated fatty acids. Polyunsaturated fatty acids have a lower melting point than monounsaturated fatty acids. Rank the following fatty acids according to their melting point, from highest melting point to lowest melting point. Rank from highest melting point to lowest melting point. To rank items as equivalent, overlap them.