Exam 2 Practice Test and Key
Exam 2 Practice Test and Key CHEM 270
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Popular in Chemistry
This 10 page Test Prep (MCAT, SAT...) was uploaded by Danielle Collier on Tuesday March 22, 2016. The Test Prep (MCAT, SAT...) belongs to CHEM 270 at California State University Chico taught by Dr. Carolynn Arpin in Spring 2016. Since its upload, it has received 11 views. For similar materials see Organic Chemistry in Chemistry at California State University Chico.
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Date Created: 03/22/16
CHEM 270-01 Fall 2014 Test #2 By signing below you are agreeing to the following statement: I will not cheat. Signed: __________________________________________________________ Printed Name: _________________________________________________________ Student Number: ____________________________________ Although you may use scratch paper, answers on additional sheets will not be graded. Please write your last name at the top of each page in this test packet in case it comes apart. GOOD LUCK!! th October 17 , 2014 Page 2: 33 points Time Limit: 50 minutes Page 3: 38 points Page 4: 22 points Page 5: 30 points Total Possible: 123 points Last Name: ___________________________ CHEM 270-01 Test #2 1. Indicate whether each structure below is chiral, achiral or meso, THEN place an * next to every asymmetric carbon. If a Newman projection or an IUPAC name is provided, you must draw out the structure and place an * next to each asymmetric carbon. (17 points) a) d) b) e) c) f) 2. a) Draw all of the chair conformers of 1-sec-butyl-3-ethylcyclohexane. b) Rank your conformers in order of increasing stability (1=least stable). Explain your ranking. c) Label each of your provided structures as cis or trans. (16 points) Page 2 of 5 Score: _______ Last Name: ___________________________ CHEM 270-01 Test #2 3. a) One stereoisomer of Compound A is provided as a Newman projection below. Draw the Fischer projections corresponding to all of the possible stereoisomers of Compound A. b) Label each asymmetric carbon in your Fischer projections as R or S. c) Label enantiomeric and diastereomeric relationships among your Fischer projections. (22 points) 4. Both of the reaction steps below are exothermic. Which one is more exothermic? Explain your choice and the reasoning behind it. Be sure to show the movement of electrons involved in resonance for your explanation. (16 points) Page 3 of 5 Score: _______ Last Name: ___________________________ CHEM 270-01 Test #2 5. Consider the reaction and its mechanism below. (22 points) a) Provide the complete reaction-energy diagram for this reaction, including all labels, transition state structures and appropriate relative energies. b) Provide the rate law for this reaction. c) Besides adding heat, how else could you increase the rate of this reaction? Explain. d) Estimate the sign (+ or –) of ΔS for this reaction. Page 4 of 5 Score: _______ Last Name: ___________________________ CHEM 270-01 Test #2 6. Consider the reaction below. (23 points) a) Predict the product(s) of this reaction, making sure to include stereochemistry. b) Would you be able to separate the products of this reaction in a relatively easy manner? Explain. c) Use curved arrows to show the movement of electron pairs for the full and complete mechanism of the reaction. Don’t worry about stereochemistry in your mechanism. Label the initiation, propagation and termination steps of your mechanism. 7. a) Provide the missing starting material for the reaction below. (3 points) b) Use curved arrows to show the movement of electron pairs for the full and complete mechanism of the reaction above with your provided starting material. (4 points) Page 5 of 5 Score: _______