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Question
Which of the following compounds has a stable trans isomer?
Which of the following compounds has a stable trans isomer?
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Solution
The correct option is B
Cycloalkenes with 8 or more carbons in a ring exhibit Geometrical Isomerism. From cyclooctene, the ring is large enough to allow the existence of trans-isomers. Hence, 8-11 membered cycloalkenes show cis-trans Isomerism. But cis is the more stable form. For 12-membered cycloalkenes and onwards, trans isomers are more stable than their cis isomers. Option (a), (c) and (d) contains less than 12 C atoms in the ring. Hence, the cis form will be more stable than trans form. In option (b), the ring contains carbon atoms more than 12. Hence, the trans form will be more stable. Therefore, the correct answer is option (b).
Cycloalkenes with 8 or more carbons in a ring exhibit Geometrical Isomerism. From cyclooctene, the ring is large enough to allow the existence of trans-isomers. Hence, 8-11 membered cycloalkenes show cis-trans Isomerism. But cis is the more stable form. For 12-membered cycloalkenes and onwards, trans isomers are more stable than their cis isomers. Option (a), (c) and (d) contains less than 12 C atoms in the ring. Hence, the cis form will be more stable than trans form. In option (b), the ring contains carbon atoms more than 12. Hence, the trans form will be more stable. Therefore, the correct answer is option (b).
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