explain the differences in the melting point and boiling point of cis-trans oleic acid by giving specific examples of the molecules.

Answer 1

The trans isomer (actually called elaidic acid) is straighter and this allows for better packing as a solid. That makes for a higher m.p.

The cis isomer (oleic acid) is more polar, so the intermolecular forces are greater, and more energy is required for separation, hence a higher b.p.