The Valence Shell Electron Pair Repulsion Vsepr Theory

Step 1: Understanding the structure of ozone ( )
Ozone is a triatomic molecule consisting of three oxygen atoms.
Its structure is angular (bent) and not linear due to the presence of lone pairs on the central oxygen atom.
Step 2: Bonding in Ozone
Ozone has a resonance structure between and .
The actual structure is a resonance hybrid where the double bond character is delocalized between the two bonds.
This means that one pi bond is delocalized over two oxygen atoms, and both O–O bonds have bond orders between a single and a double bond (about 1.5 each).
Step 3: Sigma and Pi Bond Count
Each O–O bond contains one sigma bond. There are 2 O–O bonds.
One pi bond is delocalized over these two bonds. So, total = 2 sigma bonds and 1 pi bond. Hence, the correct answer is option (4).