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), the massive angle strain permanently locks the internal -bond in the *cis* geometry. Geometrical Isomerism (the existence of both a cis and trans form) across an endocyclic double bond is only possible if the ring size is carbon atoms (e.g., Cyclooctene).

💡 Solution & Explanation

Practice 22,000+ questions like this