How many structurally distinct cyclopentane derivatives (strictly excluding stereoisomers) are possi — Isomerism and Stereochemistry Chemistry Question

💡 Solution & Explanation

A cyclopentane ring accounts for $C_5H_9$, leaving two carbons to attach as substituents. The possibilities are attaching an ethyl group (ethylcyclopentane), or attaching two methyl groups. The methyls can be attached at the 1,1-position, the 1,2-position, or the 1,3-position. This yields exactly 4 structurally distinct cyclopentane derivatives.