Why is ozone a stable allotrope of oxygen?

Answer 1

Ozone is an allotrope of oxygen but is not stable than it. But the formation of ozone is a non spontaneous process and is tend to proceed backwards most of the time.

Answer 2

Ozone is a stable allotrope of oxygen because it is a resonant structure where the three oxygen atoms are connected in a cyclic arrangement. This delocalization of electrons across the molecule increases its stability compared to other arrangements.