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The energies of the ? MOs obtained from Hückel MO theory for ? sp2 hybridised carbon...

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Chemistry

The energies of the ? MOs obtained from Hückel MO theory for ?sp2 hybridised carbon atoms forming a linear chain are givenby:

?? = ? + 2?cos ( ?? ? + 1 )

where ? is the energy level (? = 1,2, … , ?) in order ofincreasing energy.

(i) Give the values of ? for the HOMO and LUMO in butadiene.

(ii) The energy required to promote an electron from the HOMO tothe LUMO of butadiene was measured to be 309 kJ/mol. Determine thevalue of ?

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