midterm-2002-2003

midterm-2002-2003 - Problems Set of Mid-term Exam, CHEM...

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Problems Set of Mid-term Exam, CHEM 111, Fall 2002/03 1 CHEM 111 Organic Chemistry I MID-TERM EXAMINATION (Fall Semester, 19 October 2002) 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 80 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 on the answering booklet. (8 points each) (1a) The boron atom in [BF 4 ]¯ is: A. sp hybridization B. sp 2 hybridization C. sp 3 hybridization D. trigonal (1b) Consider the resonance structures, how many negative charge is on each oxygen of the CO 3 2 ¯? A. one third B. two thirds C. one D. two (1c) Predict the order of pKa value of the following substances a d . H 3 CC O OH FCH 2 C O F 2 CH C O F 3 O ab c d A. a > b > c > d B . a < b < c < d C. b > c > d > a D . b < c < d < a (1d) Which is the most stable conformation of 3-methylhexane? CH 3 CH 3 CH 2 H CH 2 CH 3 H H CH 3 CH 3 CH 2 H H CH 2 CH 3 H CH 3 CH 3 CH 2 H CH 2 CH 3 H H D. B. C. A. CH 3 CH 3 CH 2 H H H CH 3 CH 2 (1e) For the formula of C 7 H 10 F 3 NS, the degree of unsaturation is: A. one B. two C. three D. four Difficulty Level: 1.15 Your marks are normalized by a factor of 1.15 in the grade calculation.
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Problems Set of Mid-term Exam, CHEM 111, Fall 2002/03 2 (1f) Reaction of NBS with cyclopentene in H 2 O–DMSO forms a bromohydrin whose stereochemistry is: A. anti B. syn C. trans D. cis (1g) The axial conformation of fluorocyclohexane is 1.0 kJ/mol less stable than the equatorial conformation. What is the energy cost of a 1,3-diaxial interaction between
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midterm-2002-2003 - Problems Set of Mid-term Exam, CHEM...

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