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Question

Which of the following compounds will exhibit cis-trans isomerism? 
  1. 2-butyne
  2. 2-butene
  3. 2-butanol
  4. butanal


Solution

The correct option is B 2-butene
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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