CHEM 239 practice_exam_Exam_Final_Answers

CHEM 239 practice_exam_Exam_Final_Answers -...

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1 1_____2_____3_____4_____5_____6_____7_____8_____9_____10_____11_____ 12_____13_____14_____15_____16_____17_____18_____19_____20_____21_____ TOTAL_________/150 points CHEM 237, Winter 2007 FINAL EXAM Name_________________________________________________________ Student #______________________________________________________ Section Name or Time or TA Name_________________________________ 1. (3 pts) I have two pairs of molecules, A and A’ in separate bottles, as well as B and B’ in separate bottles (see pictures below). One is a pair of constitutional isomers and the other is a pair of diastereomers, but I don’t know which is which. Using a melting point apparatus, a polarimeter, and an acute sense of smell can you determine which pair are the constitutional isomers, and which pair are the diastereomers? A A’ B B’ (a) Yes (b) No (c) It depends on the compounds (d) This cannot be answered
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2 2. (12 pts) Does the Newman projection on the left have an R or S configuration?______ S ___ Determine which of the following four structural symbols corresponds to a molecule with the same absolute configuration as the Newman projection pictured? Circle them. 3. (6 pts) Indicate whether the following reactions are S N 1 or S N 2. O Cl Cl O Cl OCH 3 CH 3 OH O HCl Cl OH 4. (9 pts) True or false. a. __F___ The free energy change Δ G o in a reaction is linearly proportional to the rate constant, k. b. __F___ The Δ G o for a reaction is negative, the reagents will be favored at equilibrium. c. __T___ The enthalpy change Δ H o is independent of temperature. H H CH 3 H H 3 C Br H 3 C H Br CH 3 H H C H Br CH 2 CH 3 CH 3 Br H Br H
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3 5. (18 pts) Which of these pairs can be stored in separate bottles at room temperature? Write YES or NO in the space provided.
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CHEM 239 practice_exam_Exam_Final_Answers -...

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