Molecular orbital of benzene is like that according to my textbook (first photo)

Question

Molecular orbital of benzene is like that according to my textbook (first photo)... but I'm having trouble understanding the non-bonding term.(waht is it? shouldn't there be an orbital drawn instead of empty?) I looked up on internet and found second photo which separates 3 pi orbitals out of 6 pi orbitals of benzene. but still don't understand... where does the "non-bonding" came from?? is it something about uninteraction of pi orbitals?? I just need to understand the first photo, nevermind the second photo If you don't mind.    nt al gth gure 13.22 bergy-level diagram fo y level diagrarm for the three bonding and three antibonding MOs in benzene, with the electron wave functions. Theszeofthelobe is-proportional to the her rapnitude of the coefficient of the AO in the MO.

Explanation / Answer

In benzene ; there are total 6 MO, out of which 3 bonding and 3 Antibonding.

In the benzene each carbon atom is in SP2 state and remaining P oribiatal form 6 MO, 3 bonding and 3 antibonding.

No non bonding orbital is present in benzene

In the second diagram; it is a general idea for bonding, non bonding and anti bonding.

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