how to distinguish between cis and trans

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Juhi Sharma (1527)

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Geometric (cis / trans) isomerism

These isomers occur where you have restricted rotation somewhere in a molecule. At an introductory level in organic chemistry, examples usually just involve the carbon-carbon double bond.

n one, the two chlorine atoms are locked on opposite sides of the double bond. This is known as the trans isomer.

In the other, the two chlorine atoms are locked on the same side of the double bond. This is known as the cis isomer.

The most likely example of geometric isomerism you will meet at an introductory level is but-2-ene. In one case, the CH₃ groups are on opposite sides of the double bond, and in the other case they are on the same side.

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