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Why only alkene shows cis isomerism |
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Answer» Cis-trans isomerism is common in alkenes because there is restricted rotation about double bonds.Explanation:For example, an alkene such as but-2-ene has two different groups on each alkene carbon.It can exist as E−Z isomers that differ in the positions of the substituents on the double-bonded atoms.The double bond prevents rotation about the C=C axis.So the molecule exists as two isomers, with substituents on the same side (cis) or on the opposite side (trans) of the double bond. Due to double bond formation and have one π bond and one sigma bond |
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