Question

Cycloalkene which exhibits geometrical isomerism is

• A. Cyclopentene
• B. Cyclohexene
• C. Cyclopropene
• D. Cyclooctene

Answer 1

The correct option is D Cyclooctene

Generally in lower cycloalkenes geometrical isomerism cannot be observed at double bond site as trans isomer is not possible due to highly strained conditions. But in higher cycloalkenes it can be observed

Cyclooctene is the smallest ring that can show both cis and trans isomers because it is flexible enough to twist into the trans conformation. The cis and trans isomers of cyclooctene are shown above.