Final answer:
Cyclopentane is more stable than cyclobutane due to its minimal ring strain.
Step-by-step explanation:
Cyclopentane is more stable than cyclobutane due to its minimal ring strain. The bond angle in cyclobutane is 90°, which still results in significant ring strain. On the other hand, cyclopentane has a bond angle of about 108°, which minimizes ring strain and makes it a more stable compound.