cis-trans isomerism
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cis-1,2-dichloroethene (left); trans-1,2-dichloroethene (right)
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A form of isomerism associated with compounds containing a double bond. Like groups in such compounds may be either on the same side of the plane of the double bond (cis-form) or on opposite sides (trans-form). E.g., maleic acid and fumaric acid are, respectively, cis- and trans-forms. See also stereoisomerism.
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• ORGANIC CHEMISTRY
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