Question

Why is the boiling point of cis isomers higher?

• A. Strong intermolecular forces between the molecules of the cis isomers
• B. Polarity of cis isomers
• C. Both $A$ and $B$
• D. None of these

Answer 1

Answer: (C)

Both $A$ and $B$

Boiling point of cis isomers are higher than trans isomers because cis isomers are polar and hence they have strong intermolecular forces between the molecules. Because of this high polarity and high intermolecular force, a lot of energy will be required to break the bonds. Hence, cis isomers have higher boiling point.