new4 - Organic Chemistry Laboratory Final Exam Exam Version...

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Organic Chemistry Laboratory Final Exam Chemistry 237 Exam Version A Spring 2011 Chemistry 237 Exam Version A Page 3 of 14 HO OH OH I II III Choose the most correct answer: (4 points each) _____ 1. B The raising of the oven temperature in GC will _____ the retention times of two compounds and _____ their separation. a. lengthen, decrease b. shorten, decrease c. lengthen, increase d. shorten, increase e. not effect, not effect _____ 2. A From the following structures indicate the order of increasing reactivity in substituting a chloride for the alcohol functional group using aqueous hydrochloric acid. (least reactive to most reactive). a. I < II < III b. I < III < II c. II < I < III d. II < III < I e. III < II < I _____ 3. E Which of the following statements about an S N 1 solvolysis reaction is false ? a. an increase in concentration of nucleophile will not affect rate of reaction b. a decrease in polarity of reaction mixture slows down the reaction c. the energy of activation can be changed (lowered or raised) by changing reaction conditions d. the solvent is the nucleophile e. the reaction is a second order reaction _____ 4. B Which of the following is essential for the separation of two compounds in a mixture by preparative GC? a. They must have a different boiling point. b. They have different distribution in the stationary phase. c. They must have different molecular weight. d. Large injection volume. e. They must be volatile and thermally unstable. _____ 5. C Which of the following compounds is a phase transfer catalyst? a. Dimethylformamide (DMF) b. Naphthyl ether c. Benzyl tri- n -butylammonium chloride d. Sodium naptholate e. Dimethylsulfoxide (DMSO) _____ 6. D Which of the following statements concerning natural products is true ? a. Natural products provide the bulk of all organic chemicals. b. Natural product chemistry is a new area of study in organic chemistry. c. Natural products consist mostly of compounds derived from simple four carbon units. d. One class of natural products is derived from simple five carbon units. e. Natural products, though interesting, have played an insignificant role in the study of organic chemistry.
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Chemistry 237 Organic Chemistry Laboratory Final Exam Spring 2011 Exam Version A Page 4 of 14 Exam Version A Chemistry 237 OH O + ? _____ 7. C The product of the reaction of an amine and hydrochloric acid is: a. an ester b. an amide c. a salt d. a base e. an alcohol _____ 8. C Which of the following regions in infrared spectra is characteristic of carbonyl groups (C=O)? a. 3000 - 3500 cm -1 b. 2800 - 3000 cm -1 c. 1700 - 1800 cm -1 d. 1100 - 1200 cm -1 e. 700 - 900 cm -1 _____ 9. B What is the hybridization of the indicated carbon in the following molecule, and what are the approximate bond angles between the attached atoms? a. sp 3 , 120° b. sp 2 , 120° c. sp, 109° d. sp 2 , 109° e. none of the above _____ 10. D The dehydrohalogenation of 3-chloro-3,7-dimethyloctane with potassium hydroxide can be classified as a(n): a. S N 1 type reaction b. E1 type reaction c. SE2 type reaction d. E2 type reaction e. S N 2 type reaction _____ 11. E Which of the following would be the reagent(s) used in the reaction shown: a. NaBH 4 , H 2 O b. OsO 4 c. LiAlH 4 , H 2 O d. Ag(NH 3 ) 2 + e. NaOCl, CH 3 CO 2 H _____ 12. D
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This note was uploaded on 03/29/2012 for the course CH 318N taught by Professor Willson during the Spring '08 term at University of Texas at Austin.

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new4 - Organic Chemistry Laboratory Final Exam Exam Version...

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