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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