midterm-1999-2000

midterm-1999-2000 - Problems Set of Mid-term Exam, CHEM...

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Problems Set of Mid-term Exam, CHEM 111, Fall 1999/00 1 CHEM 111 Organic Chemistry I MID-TERM EXAMINATION (Fall Semester, 16 October 1999) Instructor: Dr. Wei-Min Dai Problems Set Note : This is a close-book examination. You are required to work on ALL problems independently. The maximum time for answering this problems set is 90 minutes. You can work on the problems in any order you like. Start with the easy problems first and do the hard ones later. Use the Examination Booklet to present your answers. Do not forget to write down your name, student ID number, course title, and date on your Examination Booklet. Total marks are 350 points. 1. Multiple choice problems. Pick up only ONE answer and write it down in the answering booklet. (8 points each) (1a) The structure of urea is shown below. The carbon atom in urea is: A. sp 3 hybridized B. sp 2 hybridized C. sp hybridized D. not hybridized C H 2 N O NH 2 (1b) The molecular formula C 2 H 4 O can be converted into three line-bond (Kekulé) structures that are consistent with valence rules. Which one of the following Kekulé structures is NOT consistent with valence rules? H C C H H O H A. C C O B. H C C H H C. C C D. H H H H O H H H H OH (1c) The equilibrium for the following reaction is: H3C C O OH H3C C O O - K + K + CN - H-CN + + p K a - 4.7 p K a - 9.1 A. favors the reactants B. is approximately 1 C. favors the products D. cannot be predicted (1d) Which of the following structures represents gauche butane? CH3 H H H CH3 H H H H CH 3 CH3 H CH 3 H CH3 H H H CH3 H H CH 3 H H A. B. C. D. (1e) The general formula for a monounsaturated alkene is: A. C n H 3n+3 B. C n H 2n C. C n H 2n+2 D. none of these
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Problems Set of Mid-term Exam, CHEM 111, Fall 1999/00 2 (1f) Which of the following structures represents the most stable conformation of 2- methylbutane? CH
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midterm-1999-2000 - Problems Set of Mid-term Exam, CHEM...

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