Action Center 11 Chemical Reactivity and Mechanisms 1

Action Center 11 Chemical Reactivity and Mechanisms 1 - 11...

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Action Center Practice Problems – Chemical Reactivity and Mechanisms 1 (Klein: Chapter 6) Sections Covered: 6.1-6.11 For this Action Center Practice Problems set we will be using specific problems from the Klein text. 1. Enthalpy: A) Work problems 1b-d in Chapter 6. Is there a trend to the magnitude of H˚ for these three reactions? If so, please provide a brief explanation. B) Work problem 2 in Chapter 6. 2. Entropy: Work problem 3 in Chapter 6. Provide a brief explanation for your predictions. 3. Gibbs Free Energy: Work problem 4 in Chapter 6. Considering your predictions of enthalpy in question 1 and entropy in question 2, which of the models (a-d) in problem 4 would best fit the following reaction. Can the reaction be exergonic? Under what conditions? Br OH O + HBr 4. Equilibra: Work problem 6 in Chapter 6. 5. Energy Diagrams: Work problem 7 in Chapter 6. 6. Nucleophiles and Electrophiles: Work problems 8, 9, and 11 in Chapter 6. For the compounds in problem
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Unformatted text preview: 11, which of the two electrophilic centers would have a larger partially positive ( δ +, less electron density)? 7. Mechanistic Steps: Work problems 12 in Chapter 6. What type of mechanistic step is occurring in 12c? If the resulting allylic carbocation shown under went a nucleophilic attack with a nucleophile such as Br–, how many distinct products would be formed? If you considered stereochemistry? 8. Reaction Mechanisms: A) Work problems 14 in Chapter 6. Compare the multiple step reactions shown in 14a and 14c. Which step is different? Provide a rationale for why the reactants in 14a would not under go the same process as shown in 14c. B) Work problem 17 in Chapter 6. Considering the kinetics of the reactions shown, which of the four reactions are similar. 9. Rank the following sets of carbocations from most stable to least stable. Would any of these carbocation structures go through a one-step hydride or methyl shift? A) B)...
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This note was uploaded on 09/26/2011 for the course CHEM 3053 taught by Professor Any during the Fall '08 term at The University of Oklahoma.

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