110_Fa11_LUZ-PracticeExamples_10_3 (1)

110_Fa11_LUZ-PracticeExamples_10_3 (1) - 2 CH 3 for 3 is CH...

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The chemical structure of a molecule (pentacene) resolved by atomic force microscopy Leo Gross of IBM Research in Switzerland, and coworkers, Science 2009, 325, 1110 What is the molecular formula of pentacene? C 22 H 14 What is the hybridization of the carbon atoms? Pentacene has resonance structures (delocalized ! bonding), so all C atoms are sp 2 hybridized. Practice Example 1. Which of the following molecules are geometric isomers? A. There are no geometric isomers. B. 1 and 2 C. 1, 2 and 3 D. 3 and 4 E. They are all geometric isomers of each other. Solve: The molecular formula for all four molecules is C 4 H 7 F, but the condensed molecular formula for 1 is CHF=CHCH 2 CH 3 , for 2 is CHF=CHCH
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Unformatted text preview: 2 CH 3 , for 3 is CH 2 =CFCH 2 CH 3 , and for 4 is CH 3 CH=CFCH3. Geometric isomers have the same molecular formula, same structural connectivity (same condensed molecular formula), but different geometric arrangement. So 1 and 2 are geometric isomers, and the correct answer is B . Practice Example Which of the following molecules will undergo an addition reaction with Br2? I. Heptane II. Pentene III. Toluene IV. Butyne A. I B. II, III C. II, III, IV D. II, IV E. all of them Solve: As shown in demo during class, alkenes and alkynes will react with Br 2 , but alkanes and aromatic hydrocarbons won’t. So the correct answer is D ....
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