C357_Exam_1P_2007 - Cornell University Chemistry 357 Exam 1...

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Cornell University Chemistry 357 Exam 1 June 11, 2007 Instructions: Read all questions completely before answering. . You may find it helpful to first answer those questions that you find easier and then return to those you find more difficult. Please follow the directions for each question as answers that are not written where or how it is specified in the question will lose all credit. Good Luck!!! Problem Score Possible 1 20 2 14 3 10 4 10 5 5 6 11 7 10 8 24 9 8 10 8 11 24 12 7 13 6 14 10 15 12 16 21 Total 200 Name:___________________________________________________ Signature:________________________________________________
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P a g e 1 o f 9 1) ( 20 ) Provide IUPAC names for each of the following compounds or, when a name is given, draw the corresponding structure. In order to receive any credit, your answer must be written on the line next to each problem. Be sure to include any stereochemical designations, where appropriate. A) B) C) D) E) CH 3 CH 2 CH 3 H 3 CH 2 C CH 3 CH 3 CH 3 H Cl H Cl H
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P a g e 2 o f 9 2) ( 14 ) Draw a resonance contributor for the compound shown below that has no separation of charge. You should draw the electron-pushing arrows that get you from the structure below to the contributor you propose, as well as drawing your proposed contributor. N + H 3 C H C C - C C N N N 3) ( 10 ) The B-F sigma bond has been measured at 1.52 Angstroms. The observed bond B-F bond length in the compound BF 3 is 1.30 Angstroms.
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C357_Exam_1P_2007 - Cornell University Chemistry 357 Exam 1...

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