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Why do alkenes show geometrical isomerism? Explain with examples.
Asked by Topperlearning User | 01 Jun, 2016, 01:50: PM
answered-by-expert Expert Answer
Due to C=C bond, the rotation around this bond is restricted. Geometrical isomerism is due to the presence of like groups on the same side(cis-isomer) or on the opposite side (trans-isomer). The presence of two different groups at the doubly bonded carbon is the necessary and sufficient condition for geometrical isomerism.

             C(a,b) = C(a,b) , C(a,b) = C(e,f) or

              C(a,b) = C(a,d) all show geometrical isomerism.

Answered by | 01 Jun, 2016, 03:50: PM

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