CHEM2211 Exam 1 2010 one more

CHEM2211 Exam 1 2010 one more - N ame _ _ Last, First 810#...

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Name ____________________ ______ ______________ ______ __ _ Last, First 810# CHEMISTRY 2211 EXAM 1 September 15, 2010 Be sure to read each question carefully. Partial credit will be assigned where appropriate. To receive full credit you must answer the question completely. Relax and good luck!! 1. (6 pts) Consider the following compounds: Cis-1-ethyl-2-methylcyclohexane Trans-1-ethyl-2-methylcyclohexane Which of these two compounds is the most stable overall? Draw the most the most stable chair conformation of the compound you indicated in the box above: H Provide the total strain energy for this conformation: Y.O KJ/mol SCORE 1. ___ _ 2. ------- 3. ------- 4. ____ __ 5. ______ _ 6. ____ __ _ 7. ______ _ 8. ______ _ 9. ___ _ 10. ___ _ Total: __ _
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Name: -------------------------------- 2. (10 pts) Looking down the Carbon 3 - Carbon 4 bond of 3-chloro-4-ethylhexane, provide the following: Draw all three staggered conformations, circle the least stable conformer and calculate its total strain energy: H H 4 C-I Total strain energy for the least stable conformer: 1.L-j +-J.Lt + '1. 1. = 7.0 Lt. '2. + Lf.'2. .. fLY :"7 .8 ~""""""" . . _ . . = _ . __ . """' . . . ~= .. __ . _= _~ _= __ . ... = . """""",,,,,,,,,,,,,,,,,,,,,,,,,,,,,j KJ/mol Draw all three eclipsed conformations, circle the
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CHEM2211 Exam 1 2010 one more - N ame _ _ Last, First 810#...

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