Cis-trans isomerism in chemistry, shown at butene. Cis indicates the functional groups on same side, trans conveys that they are opposing.

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Cis-trans isomerism in chemistry, shown at butene. Also known as geometric or configurational isomerism. Cis indicates the functional groups on same side, while trans conveys that they are opposing.

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Photo credit: © Peter Hermes Furian / Alamy / Afripics
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