Practice Midterm

Practice Midterm - CHE321 Midterm #1 20 Sep 2005 Form 0...

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CHE321 Midterm #1 20 Sep 2005 1 Form 0 This exam has 8 pages. This exam has 19 questions. The first 12 questions are multiple choice, are worth 5 points each, and should be answered by filling in the appropriate bubble for each question. Questions 13-19 are short answer and should be answered in the space provided on the front and back of the answer form. Some useful data Conformational Energies for Monosubstituted Cyclohexanes Group - Δ G ° (axial equatorial), kJ/mol (298K) C N 0.8 F 1.0 C CH 1.7 I 1.9 Cl 2.2 Br 2.4 OH 3.9 NH 2 5.9 COOH 5.9 CH=CH 2 7.1 CH 3 7.28 CH 2 CH 3 7.3 CH(CH 3 ) 2 9.0 C(CH 3 ) 3 21.0
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CHE321 Midterm #1 20 Sep 2005 2 1. (5 points) Which one of the following Lewis structures is not correct? 2. (5 points) Which one of the following molecules has incorrect hybridization indicated? O O O O OH O N N H H a b c O S Cl Cl O d e O sp 2 sp 2 sp 2 O N sp 3 sp 2 sp 2 sp 2 O sp 3 sp 2 sp 2 a b c O H sp 3 sp 3 sp 2 sp Cl N sp sp 3 sp d e
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CHE321 Midterm #1 20 Sep 2005 3 3. (5 points) The molecule nitromethane, CH 3 NO 2 , has a central nitrogen atom bound to the methyl group and to the two oxygen atoms. Draw appropriate Lewis structures of nitromethane. Which one of the following statements about nitromethane is incorrect? a.
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This note was uploaded on 11/13/2010 for the course CH 221 taught by Professor Melander during the Fall '07 term at N.C. State.

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Practice Midterm - CHE321 Midterm #1 20 Sep 2005 Form 0...

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