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Chemistry LibreTexts

Unsymmetrical Alkene

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An unsymmetrical alkene is an alkene in whose molecule the pair of ligands on one doubly bonded carbon is different from that on the other.

eg. 1:

unsymmetricalalkene1.png

In 1, one doubly bonded carbon bears two methyl groups and the other a methyl group and a hydrogen atom. Thus, 1 is an unsymmetrical alkene.

eg. 2:

unsymmetricalalkene2.png

In 2, one doubly bonded carbon bears two methyl groups and the other a methyl group and an ethyl group. Thus, 2 is an unsymmetrical alkene.

eg. 3:

unsymmetricalalkene3.png

In 3, one doubly bonded carbon bears a methyl group and a hydrogen atom and the other an ethyl group and a propyl group. Thus, 3 is an unsymmetrical alkene.

In an organic molecule, a carbon-carbon double bond in which the carbon atoms bear different pairs of ligands is called an unsymmetrical double bond.

eg:

unsymmetricalalkene4.png

see also symmetrical alkene

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This page titled Unsymmetrical Alkene is shared under a All Rights Reserved (used with permission) license and was authored, remixed, and/or curated by Gamini Gunawardena via source content that was edited to the style and standards of the LibreTexts platform.

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