The structural formulas for two isomers of 1, 2-dichloroethene are shown above. Which of the two liquids has the higher equilibrium vapor pressure at 20 degrees Celsius and why? A) the cis-isomer, because it has dipole-dipole interactions, whereas the trans-isomer has only 1 London dispersion forces.
B) the cis-isomer, because it has only London dispersion forces, whereas the trans-isomer also has dipole-dipole interactions
C) the trans-isomer, because it has dipole-dipole interactions, whereas the cis-isomer has only 1 London dispersion forces
D) the trans-isomer, because it has only 1 London dispersion forces, whereas the cos-isomer also has dipole-dipole interactions