Draw the cis–and trans–structures for hex–2–ene. Which isomer will have higher b. p. and why ?
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Cis and Trans isomers are known as geometric isomers. It is present in alkenes.
When two "similar or higher priority" groups are attached on the one side, it is referred as "Cis isomer" and when attached to the "opposite sides", it is referred as "Trans isomer".
The "cis" and "trans" isomer of "Hex-2-ene" are as follows.
The cis isomer will have a higher boiling point due to higher priority groups are present in the same side, therefore, more polar nature of these groups are leads stronger interactions between them, to separate these dipole requires more heat energy, while trans from being non-polar (or weakly polar) has weak dipole interactions and so, it results in "lower boiling point".
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