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Chem242E#2S11 - Chem 242 Exam#2 Spring 2011 Name 100 points...

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Chem& 242 Exam #2 Spring 2011 Name ____________________ 100 points possible Any changes to the exam will be written on the board. Each question is worth 5 points unless noted. 1. Several studies have shown that Beta-carotene may play a role in preventing cancer. Beta-Carotene has a molecular formula of C 40 H 56 . Upon catalytic hydrogenation it yields a compound with the molecular formula of C 40 H 60 . If Beta-Carotene contains no triple bonds, how many double bonds does it have? 2. Draw the structure of (E)-1,2-dibromo-3-isopropyl-2-hexene. 3. How would you use 1 H NMR to distinguish between these pairs of isomers? Explain what you would see in the spectra. (8 pts) CH 3 CH 2 OCH 2 CH 3 and CH 3 OCH 2 CH 2 CH 3 4. The NMR peak intensities for a quartet are: (4 pts) a. 1:2:2:1 b. 1:3:3:1 c. 1:4:4:1 d. 1:1:1:1 e. none of these
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5. Listed here are 1 H NMR absorption peaks one compound. Propose a structure that is consistent with the data. (10 pts) C 8 H 8 Br 2 doublet, δ 2.02, 3H quartet, δ 4.48, 1H doublet, δ 7.24, 2H doublet, δ 7.63, 2H 6. The addition of Br 2 to alkenes involves what intermediate?
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