FALL 2010 second exam - Corrected PRACTICE

FALL 2010 second exam - Corrected PRACTICE - CHEM 233...

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Name: ____________________________ Lab section: AB ___ TA name: __________________________ First 3 letters of your last name Multiple choice Question 53 Question 54 Question 55 Question 56 Question 57 Question 58 Question 59 Question 60 Question 61 Total score Exam instructions: 1. This is a 120 minute exam. 2. Answer each multiple choice question with the best answer. 3. Mark all answers to multiple choice questions on the scantron sheet. 4. Multiple choice answers on the test packet will not be graded. 5. Answer questions 53-61 on the test packet. Show your work in the space provided. Place your answers in the boxes provided. Answers or work on the backs of pages will not be graded. 6. To answer NMR unknown problems, follow the format indicated on the NMR study guide. 7. Fill in the name and section portion on your scantron sheet. Blacken the corresponding bubbles. 8. Lab sections should be coded on the scantron sheets as 00001-00007, AB1 corresponds to 00001, AB2 corresponds to 00002, etc… 9. Charts of spectroscopy data are in the back of the test packet. CHEM 233 Second exam, Fall 2010 DO NOT open exam booklet until instructed to do so PRACTICE EXAM
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3. In proton NMR, peak splitting arises from… A. Atoms undergoing nuclear decay B. Interaction of magnetic fields C. Interaction of electrons D. Flipping magnetic moments E. Deuterium in the solvent 5. Why can’t 12 C be observed in the NMR techniques presented in class? I. There is too little in the samples II. Its spin quantum number = 0 III. The ratio of 1 H to 12 C signal is too large A. I, B. I, II C. II D. I, III E. I, II, III 2. To separate volatile compounds A (BP = 67 °C) and B (BP = 89 °C), which distillation technique should be used? I. Simple distillation II. Fractional distillation A. I B. II C. Both I and II D. Neither I or II E. Theoretical plates 4. Which of the following is true of unimolecular substitution (S N 1)? I. It shares an intermediate with E1 II. The reaction must be distilled to work III. The leaving group leaving is the rate determining step A. I, II, III B. I, III C. II D. I E. None of the above 6. What was done in the esterification of benzoic acid to shift the equilibrium toward products? A. Adding excess methanol B. Removing water C. Removing benzoic acid D. Adding excess benzoic acid E. None of the above 8. Which of the following is a meta-directing substituent in electrophilic aromatic substitution? A. OH B. NH 2 C. NO 2 D. Br E. None of the above 1. How many steps in the mechanism of the Fisher esterification are catalyzed by acid? A. 1 B. 2 C. 3 D. All E. None 7. The competing reaction of an aldol condensation is… A. E1 B. Double addition C. Cannizzaro disproportionation D. Esterification E. Clemmensen reduction Multiple choice (2 points each).
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360 362 364 366 368 370 372 374 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Temperature (K) mole fraction propanol 10. Which sentence best describes this mixture of water and propanol? A.
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FALL 2010 second exam - Corrected PRACTICE - CHEM 233...

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