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mt1key - Chem 140A Midterm I Answer Key Q1(16 points Q2(14...

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Chem 140A Midterm I Answer Key October 15, 2009 Q1_________(16 points) Q2_________(14 points) Q3_________(12 points) Q4_________(17 points) Q5_________(12 points) Q6_________(12 points) Q7_________(17 points) Total_________(100 points) If you write the exam in pencil or erasable pen, you give up your right to any kind of regrade. Name_______________________ PID_________________________
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1. Functional Groups (16 points). Please circle the functional groups present in the following molecules and give their names.
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2. Conformational Isomerism (14 points). Draw the following molecules in Newman projections. Indicate whether they are staggered or eclipsed forms. A. The most stable conformational isomer of 2,3-dimethylbutane No eclipsing 2 methyl-methyl gauche interactions b. The least stable conformational isomer of 2,3-dimethylbutane Maximum eclipsing of bonds 2 methyl-methyl eclipsing interactions
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3. Orbital Description (12 Points). Draw the orbital diagram/structure of the molecule shown below, clearly indicating the identity of all atoms and the hybridization of each orbital. Please be sure that your drawing is geometrically correct, with approximate bond angles indicated.
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