Exam_1-Chem35-2007

Exam_1-Chem35-2007 - Name_ SISD_ Chemistry 35 Exam 1 -...

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Name____________________________ SISD________________________ 1 Chemistry 35 Exam 1 - February 28, 2007 Put your name and SISD number on EVERY PAGE of the exam. Write all answers on the exam. There are several blank pages at the end of the exam for you to use as scratch paper. 1. (20 points)_____________________ 2. (20 points)_____________________ 3. (12 points)_____________________ 4. (20 points)_____________________ 5. (10 points)_____________________ 6. (18 points)_____________________ Total (100 points)_________________
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Name____________________________ SISD________________________ 2
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Name____________________________ SISD________________________ 3 Problem 1 . (20 points) For each molecule (parts A - C): (i) Draw the two possible cyclohexane chair conformations. (ii) Circle the H underneath the conformer that is Higher in energy (less stable). Circle the L underneath the conformer that is Lower in energy (more stable). Use the templates provided to draw the chair conformations. You must draw, unambiguously, the Methyl groups in the proper equatorial or axial positions. The molecules and the chair templates are numbered. Make sure to draw the chair conformations using the numbering scheme that matches the given structure. A) (5 points) 1 2 3 4 1 2 3 4 1 2 3 4 A: H or L A :H o r L B) (5 points) 1 2 3 4 1 2 3 4 1 2 3 4 B: H or LB : H o r L
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Name____________________________ SISD________________________ 4 C) (5 points) 1 3 5 C: H or LC : H o r L 1 3 5 1 3 5 D) (5 points) In parts A) – C) of this problem you have generated six cyclohexane chair conformations that are labeled A-H, A-L, B-H, B-L, C-H and C-L.
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Exam_1-Chem35-2007 - Name_ SISD_ Chemistry 35 Exam 1 -...

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