Answer: unhybridized pi oribtals
Explanation:
The pi bond is always formed by the sideways overlap of unhybridized p-orbitals that include Py and Pz orbitals.
The 2Py and 2Pz orbiatls in each carbon atom forming the benzene ring, are unhybridized that are responsible for pi bond formation between the carbon atoms that form a benzene ring.
The delocalized π system in benzene is formed by a cyclic overlap of 6 pi orbitals.
In benzene, there are three sigma bonds and three pi bonds. The molecule has has a system of conjugated double bonds which makes it possible for delocalization of pi electrons to occur in the molecule.
The π system in benzene is delocalized over six pi orbitals in the molecule hence, the π system in benzene is formed by a cyclic overlap of 6 pi orbitals.
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