CHEM 281 - 2011-3 Problem Set 2 - WEEK 3

CHEM 281 - 2011-3 Problem Set 2 - WEEK 3 - CHEMISTRY...

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CHEMISTRY 281-4 (2011-3). Dr. Pete Wilson ORGANIC CHEMISTRY I: PROBLEM SET 2. WEEK 3 – LECTURE 7/8 Selected Problems from Past Inter-term Examinations For discussion in tutorials (Week 4) in addition to any other general questions you may have about the course material. For Problem Set 2, please go to: http://www.chemistry.sfu.ca/courses/course/CHEM 281 Notes: Your first inter-term examination will consist of questions that relate to the topics covered in class up to the end of Week 4. This problem set is representative, if not beyond (because of curriculum changes and that your examination is earlier than in previous years), of what you may expect in your first inter-term examination. Scroll down…. . 1
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SIMON FRASER UNIVERSITY Organic Chemistry I, 2005-3 CHEM 281 Dr. Peter D. Wilson INTER-TERM EXAMINATION 1 (12.5 % of total course evaluation) 10:35 – 11:20 a.m. Wednesday 19, October 2005 Answer all of the questions (8 questions). Your exam consists of 8 printed pages including this one (please check this when you are told to do so). Fill in your name and student number below. The use of a copy of the periodic table, molecular models and an electronic calculator is allowed. NAME: ………………………………………………………………… STUDENT #: …………………………………………………………………. Marking Scheme Question Marks Score 1 5 2 5 3 5 4 10 5 6 6 4 7 9 8 6 TOTAL 50 TOTAL 12.5 2
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1. a). Draw the chemical structures of the three stereoisomers of 1,2-dimethylcyclopropane. You should use wedged and hatched bonds to carefully show the stereochemistry (3 marks). wedged (substituent "up") = hatched (substituent "down") = 1. b). One of the structures that you have drawn above represents an achiral compound (a non-chiral meso compound). Draw a circle around this structure (1 mark). 1. c). What is the stereochemical relationship of the other two stereoisomers ( i.e. the ones that you have not drawn a circle around) - are they diastereoisomers or enantiomers (1 mark)? 2.
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This note was uploaded on 12/07/2011 for the course CHEM 281 taught by Professor Williams during the Fall '11 term at Simon Fraser.

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CHEM 281 - 2011-3 Problem Set 2 - WEEK 3 - CHEMISTRY...

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