Would a cis or trans isomer have a higher boiling point?
Cis-isomers generally have higher boiling points. The Latin
prefix cis- means "on the same side." This generally means the
molecule will have a greater concentration of either a dipole or
dispersion forces on one side of the molecule as opposed to
another. This will mean the greater probability of that molecule
either being polar or having a temporary dipole, which means
greater attraction between those molecules. In a trans-isomer,
which means "across from," you will have a certain atom across the
molecule from the other, which means often, those potential dipoles
or dispersion forces will "cancel each other out," meaning less
probability for attraction between molecules.