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The number of pi molecular orbitals comp...

The number of `pi` molecular orbitals completely filled in the ground state of benzene is:

A

three

B

one

C

six

D

none

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The correct Answer is:
A
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L.C.A.O. Principle is involved in the formation of the molecular orbitals according to molecular orbital theory. The energy of the bonding molecular orbital is less than that of the combining atomic orbitals while that of the antibonding molecular orbitals while that of the order (B.O.)=1/2(N_(b)-N_(a)) helps in predicting (i) formation of molecules/molecular ions, bond dissociation energy, stability and bond length. Only the molecules or ions with positive B.O. can be formed. These will be diamagnetic if all molecular orbitals are dilled and paramagnetic if one of more are half filled. The atomic orbitals at the time of overlap must have the same symmetry as well. In the homonuclear molecule which of the following sets of M.O. orbitals are degenerate ?

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RESONANCE ENGLISH-AROMATIC COMPOUNDS -PART-II: NATIONAL STANDARD EXAMINATION IN CHEMISTRY (NSEC) STAGE-I
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