PS10_08 - Chem 442 Homework Set#10 DUE Wednesday 1 2 3 4...

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Chem 442 Homework Set #10 DUE: Wednesday, November 19, 2008 1) McQ&S, 10-18 2) McQ&S, 10-20 3) McQ&S, 10-23 4) The lowest energy electronic transitions in ethene (C 2 H 4 ) and benzene (C 6 H 6 ) occur at 28,700 and 29,510 cm -1 , respectively. Using Hückel theory, determine the value of β (in cm -1 ) for both molecules (assuming that the lowest energy electronic transition in each molecule occurs between the highest occupied and lowest unoccupied π orbital). How well did Hückel theory work, i.e., are your two values for β similar? 5) Using the energy formula expression in problem 10-43, calculate the lowest energy electronic transition in 1,3-butadiene and 1,3,5-hexatriene using the
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