Question

In the molecular orbital model of cyclobutadiene, how many -antibonding molecular orbitals are there?

Answer 1

There are one antibonding molecular orbitals present in molecular orbital model of c.

The cyclobutadiene has a pi system comprised of four  individual atomic p - orbital and thus should have a four pi   molecular orbitals. The compound is the prototypical antiaromatic hydrocarbon with 4 $\pi$ - electrons .  Its rectangular structure is the result of jahn teller reaction which disorder the molecule and lowers its symmetry , converting the triplet to a singlet ground state. It is a small annulene . The  delocalisation energy of the  $\pi$   electrons of the cyclobutene is predicted to be zero .

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