Geometrical Isomerism across an endocyclic (internal) double bond is strictly dependent on ring size. At what minimum cycloalkene ring size does the highly strained 'trans' isomer become physically po

Question

Geometrical Isomerism across an endocyclic (internal) double bond is strictly dependent on ring size. At what minimum cycloalkene ring size does the highly strained 'trans' isomer become physically possible and isolable at room temperature?

Prashant Kotian · Accepted Answer

Correct answer: C. In small cycloalkene rings (3-7 carbons), massive angle strain permanently locks the internal -bond in the cis geometry. Geometrical Isomerism across an endocyclic double bond is only possible if the ring size is carbon atoms (e.g., Cyclooctene).

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