Discussion Forum : Isomerism
Question -


Which of the following compounds will exhibit cis-trans isomerism? 

Options:
A .   2-butene
B .   2-butyne
C .   2-butanol
D .   butanal
Answer: Option A
:
A
The compounds with each doubly bonded carbon attached to two different groups (like Cab=Cab, Cab=Ccd) exhibit geometrical isomerism i.e., cis and trans forms. The geometrical isomerism arises due to the restricted rotation of the double bond.
However, even though there is restricted rotation for a triple bond, alkynes do not exhibit geometrical isomerism, since the triply bonded carbons are attached to only one group each.

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