midterm-2001-2002

midterm-2001-2002 - Problems Set of Mid-term Exam, CHEM...

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1 CHEM 111 Organic Chemistry I MID-TERM EXAMINATION (Fall Semester, 20 October 2001) 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 structure of ozone, O 3 is: A. linear with the central oxygen in sp hybridization B. linear with the central oxygen in sp 2 hybridization C. trigonal planar with the central oxygen in sp hybridization D. trigonal planar with the central oxygen in sp 2 hybridization (1b) How many line-bond (Kekulé) structures, that are consistent with valence rules, are possible for the molecular formula C 3 H 9 N? A. one B. two C. three D. four (1c) Sodium bicarbonate, NaHCO 3 , is the sodium salt of carbonic acid (H 2 CO 3 , p K a = 6.37). Predict which of the substances below will react with sodium bicarbonate. A. acetone (p K a = 19.3) B. acetic acid (p K a = 4.76) C. 2,4-pentanedione (p K a = 9) D. phenol (p K a = 9.9) (1d) Which of the following conformations is the least stable one? CH 3 H H H CH 3 H 3 C CH 3 H H CH 3 H H 3 C CH 3 H H H H 3 C H 3 C CH 3 H H CH 3 H 3 C H D. B. C. A. (1e)
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This note was uploaded on 02/27/2010 for the course CHEM CHEM111 taught by Professor Dai during the Fall '06 term at HKUST.

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midterm-2001-2002 - Problems Set of Mid-term Exam, CHEM...

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