CHEM 202 Practice Exam 5

CHEM 202 Practice Exam 5 - C HEM202 Practice Exam 5 Fall...

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CHEM202 Practice Exam 5 Fall 2010 NAME: Dr. Thomas Berg Total Points 125 Questionsl-25 : 5 points each
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1. Classify the molecule below according to the location of its carbonyl group and the number of carbon atoms. a) aldotriose b) aldotetrose c) aldopentose d) ketotriose e) ketotetrose 2. Which of the following aromatic compounds is the most stable? IV. I. 0 0 II. V. 0 0 N 0 0 .- H I m. e a) I b) II c) III d) IV e) V
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3. \Vhat is the major product of the following reaction? Br--CJ-Br + N I H N. 1. v. n. ill a) I b) II c) III d) IV e) V 4. Six-membered cyclic hemiacetals and five-membered cyclic hemiacetals are called respectively: a) mannoses and xyloses. b) maltoses and arabinoses. c) furanoses and pyranoses. d) glyoses and fructoses. e) pyranoses and furanoses.
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5. At which carbon are the following sugars epimers of each other? RC=O HC=O -H Ro- H- -OR HO- -R g- HO- CH20H CH20H a) C-1 -oH b) C-2 c) C-3 d) C-4 e) C-5 6. L-Mannose (an aldohexose) has enantiomer(s) and diastereome( s). a) 1 1 b) 1 7 c) 1 14 d) 2 6 e) 2 14 7. 'What is an acceptable name for the following structure? s Q a) aziridine b) oxetane c) oxirane d) azetitidine e) thiirane
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8. What is the major product ofthe following reaction? /\ --,. ... ? :N :NH ~ 1 Br :hNH IV. 'V ll. J \ V. I Br a) I b) II c) III d) IV e) V 9. In solution, glucose exists as: a) the open-chain form only. b) the cyclic hemiacetal form only. c) the cyclic acetal form only. d) an equilibrium mixture of the open-chain form and the cyclic acetal forms. e) an equilibrium mixture of the open-chain form and the cyclic hemiacetal 10.
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CHEM 202 Practice Exam 5 - C HEM202 Practice Exam 5 Fall...

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