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Cis-trans isomerism, also known as geometric isomerism, occurs in alkenes due to the inflexibility of the double bond (there is no interconversion of the substituents of an alkene by rotation). In a cis isomer, the substituents attached to the double-bonded carbons are on the same side, while in a trans isomer, they are on opposite sides. This form of isomerism is important because cis and trans isomers often have different physical and chemical properties, which lead to different reactivities and interactions in biological systems. For example, a cis alkene is more polar than a trans alkene, giving it a slightly higher boiling point and making it more soluble in polar solvents. (责任编辑：) |