Which of the Following Best Defines Cis-Trans Isomers?
The cis-trans isomers of a molecule differ in their atom and bond arrangements around the double bond. They also differ in their biological activity. The chemical properties of cis-trans isomers are the same as those of their trans counterparts, but they are not identical. A molecule that contains a methyl group may have a different arrangement of the double bond than its trans counterpart.
This symmetrical alkene is composed of a double bond, which allows the molecules to rotate around each other. This makes the cis-trans isomer, which has the two chlorine atoms attached on one side, the trans-trans isomer, which has the chlorine atoms on the opposite side of the double bond.
Apart from atom arrangements, trans-trans and cis-trans isomers differ in the spatial arrangements of their double bonds. The differences between the isomers’ structures are due to the differences in the orientation of the functional groups, which are on opposite sides of the plane.
Organic and inorganic compounds contain cis-trans isomers. They can also be found in coordination compounds, such as diazenes. The latter exhibits axial chirality and is highly stable. Hence, the question is, which of the following best describes cis-trans isomers?
The differences between the cis and trans isomers can be small or large. Pent-2-ene has a lower boiling temperature than its trans isomer. The boiling point of 1,2-dichloroethenes is also different, with the cis having a temperature of 60.3 degrees Celsius and the trans having 47.5 degrees.
Cis-trans isomerism in alkenes is possible. But the rotation around the pi bond is restricted. Because the pi bond overlaps with a C-sigma bond in another molecule, rotation around it is not possible.