261 f06 exam 1 Soln key

261 f06 exam 1 Soln key - Chemistry 261 F06 Dr. Mbadugha...

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Chemistry 261 F06 Exam 1 Dr. Mbadugha Honor Code: I have neither given nor received unauthorized aid on this exam. I understand that I am not allowed to use any notes, books or resources (with the exception of molecular models and the Periodic Table). I also understand that removal of the exam from the testing room or receiving aid from any other person or person’s exam constitutes an honor code violation. I also understand that making any change to an exam answer after it has been graded, with the intent of submission for regarding is an honor code violation. Signature: Soln Key Date: ____________ Please clearly print your first and last name: ____________________________________ Score: 1. (5 pt) Would you expect C(CH 2 Cl) 4 to have a dipole? Why or why not? No. The individual C-Cl dipoles are canceled out by the tetrahedral arrangement of the molecule, as was the case for instance with CCl 4 . H 2 C ClH 2 C CH 2 Cl CH 2 Cl Cl 2. (10 pt) a. Label each chiral center in the structures below as R or S. b. Label each compound as chiral or achiral OH CH 3 OH OH H OH H CH 2 OH CH 2 OH H CH 3 H 3 C CH 3 CH 3 H I III II IV R chiral S R meso; achiral S chiral R S meso; achiral 1
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3. (12 pt) Designate the following pairs of compounds as enantiomers, diastereomers, cis/ trans stereoisomers, same molecule or constitutional isomers. CH 3 Cl H 3 CH 2 C Br CH 2 CH 3 Br H 3 C Cl and H CH 3 H CH 3 H Cl H CH 3 H H H 3 C Cl and and H CH 3 H H 3 C H CH 3 H 3 C H CH 3 H 3 C H CH 3 H H CH 3 H 3 C H H H H 3 C and and Cl and Cl I II III IV V VI Same molecule cis/trans stereoisomers or diastereomers cis/trans stereoisomers
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261 f06 exam 1 Soln key - Chemistry 261 F06 Dr. Mbadugha...

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