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Question
Arrange the following alkenes in increasing order of their boiling points.
Arrange the following alkenes in increasing order of their boiling points.
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Solution
With the addition of each -CH2 group, the boiling point of alkene increases by 20−30°C. So Hex-3-ene has higher boiling point.
Trans-alkene has zero dipole moment. Cis- alkene has some dipole moment, thus the compound has some polarity, in turn higher attractions between two molecules.
This results in higher boiling points of cis- alkenes than trans.
Trans-alkene has zero dipole moment. Cis- alkene has some dipole moment, thus the compound has some polarity, in turn higher attractions between two molecules.
This results in higher boiling points of cis- alkenes than trans.
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