CHEM 281-2011-3 Inter-term Examination 1

CHEM 281-2011-3 Inter-term Examination 1 - SIMON FRASER...

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SIMON FRASER UNIVERSITY Organic Chemistry I, 2011-3 CHEM 281 Dr. Peter D. Wilson INTER-TERM EXAMINATION 1 (12.5 % of total course evaluation) 10:35 – 11:15 a.m. Wednesday 5, October 2011 Do not open the examination pamphlet until you are asked to do so. Answer all of the questions (6 questions). Your exam consists of 7 printed pages including this one (please check this when you are told to do so). Fill in your name and student number as well as indicate your tutorial information below. The use of a simple copy of the periodic table, molecular models and an electronic calculator is allowed. Please write in pen but not red ink. OFFICIAL NAME: ……. .…………………………………………………… STUDENT #: …………………………………………………………. Marking Scheme Question Marks Score 1 9 2 7 3 12 4 8 5 8 6 6 TOTAL 50 TOTAL (50/4), 12.5 Please write the name of your TA and/or tutorial session here : ……………. .………… [ i.e. Matt, Stan, Tony or Venu ] 1
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1. Consider the molecular ion, +CH 3 (the “methyl carbocation”) and answer the following questions. Of note, this species is trigonal planar ( i.e. the bond angles are 120°). (9 marks) 1. a). How many valence shell electrons does the carbon atom have in the “methyl carbocation”? Note, the carbon atom of methane (CH 4 ) has 8 valence shell electrons. (1 mark) 1. b). What is the hybridization of the carbon atom in the “methyl carbocation”? (1 mark)
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CHEM 281-2011-3 Inter-term Examination 1 - SIMON FRASER...

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