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  4. Assertion: Cyclobutane is less stable than cyclopentane. Reason: Presence of bent bonds causes loss of orbital overlap.

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Q. Assertion: Cyclobutane is less stable than cyclopentane.
Reason: Presence of bent bonds causes "loss of orbital overlap".

AIIMSAIIMS 1995

Solution:

In cyclobutane, there is angle strain as bond angle $(C-C-C)$ is close to $90^{\circ}$. Due to this kind of angle effecting overlapping of orbitals cannot take place.