How will you distinguish between the two geometrical isomers of 1.2-dichloroethene from their boiling points?

How will you distinguish between the two geometrical isomers of 1.2-di

1.	How will you distinguish between the two geometrical isomers of 1.2-dichloroethene from their boiling points?
Answer» SOLUTION :The 2geometrical isomers of 1,2 dichloroethane are cis- 1,2dichloroethane and trans-1,2 dichloroethene. Cis-1,2 dichloroethene has a definite dipole moment `(mu NE0)` whereas the dipole moment of trans-1,2 dichloroethene is found to be zero `(mu=0)`. the cis isomer is hightly polar indicating strong dipole-dipole attractive forces AMONG the molecules. hence a LARGE amount of energy is required to separate the molecules from each other, therefore boiling point of cis-1,2 dichloroethene is HIGHER than the trans-isomer.