mid-term2answers - CHM 3120 Mid Term Test Answers 1....

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1 CHM 3120 Mid Term Test Answers 1. Consider the following reaction 16 points . h ν a) Draw the LCAO representations of all the π molecular orbitals of the product. b) Identify each orbital c) Show the distribution of π electrons in the product immediately after the reaction. d) Identify the frontier orbitals e) Identify which orbitals are bonding and which are antibonding. f) What is the relative stereochemistry of the starting material? Justify briefly your answer. HOMO LUMO Bonding antibonding 1 1 1 1 1 2 1 1 1 1 Ψ 1 Ψ 2 Ψ 3 Ψ 4 Ψ 5 Ψ 6 1 1 h ν motion is conrotatory H H 1 1 1 Ψ 4 trans cis cis R R starting material must be cis 2. Compounds A and B are easily interconverted by heating. After 51 days at 100 °C, it was calculated that 2.6 X 10 6 interconversions had taken place and only A and B were found in the mixture. Explain how A is converted to B and why no C or D were present after 51 days. 8 points
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2 CD 3 Ph Ph CH 3 100 °C Ph CD 3 CH 3 Ph A B CD 3 Ph CH3 Ph C Ph CD 3 Ph CH 3 D Mechanism CD 3 Ph
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mid-term2answers - CHM 3120 Mid Term Test Answers 1....

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