Question

Explain the boiling point of cis is more than trans

Answer 1

Which has more boiling point cis or trans?

In the cis isomer, both the bulky groups are present on the same side, hence it has a dipole moment, (which gets cancelled out in case of trans). Thus, cis-But-2-ene has a higher dipole moment due to which it is more ionic, hence higher boiling point.

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