Exam 1 - Fall 2003

Exam 1 - Fall 2003 - Organic Chemistry Chem 38 Practice...

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Organic Chemistry: Chem 38 Practice Exam 1 C There are 31 questions on this exam. Check that you have done all of the problems and filled in the first 31 bubbles on the scantron. Most questions are worth 4 points; there are several two-point questions clearly labeled in the text. The maximum score on this exam is 100 points. Instructions Answer sheet 1) On the scantron, you need to clearly fill: • your name and your student number , section number Section 001, 12:20 pm lecture Section 002, 3:35 pm lecture test form (white = test form A; yellow = test form B). 2) Use a #2 pencil Exam policy 1) Molecular models are allowed, calculators are not allowed. 2) There are some blank pages at the end of the test that can be used as scratch paper. 3) Relevant tables, including the periodic table, are attached at the end of this exam. 4) Numerical values given in one question apply only to this question, and should not be used in other questions, unless there is a specific instruction to do so. If necessary, the values from the provided tables should be used, even if they differ from values that you may remember from different sources. 5) Feel free to take this copy of the exam with you. The answer key will be posted on the web after the exam (under "News"). Hints 1) As you read the question, underline or circle key words to highlight them for yourself. 2) Questions have only one correct answer, unless indicated otherwise. No partial credit will be given. 3) There is no penalty for guessing. 1
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1. (4 pts) How many constitutional isomers of cycloalkanes with the formula C 5 H 10 have at least one 3 o hydrogen? a) 1 b) 2 c) 3 d) 4 e) 5 2. (4 pts) Which one of the following isomeric structures has the lowest energy? H CH 3 H CH 3 CH 3 H H H H H H CH 3 CH 3 CH 3 H H H 3 C H H CH 3 H H H CH 3 H H H 3 C H CH 3 H H CH 3 H CH 3 H H CH 3 H H CH 3 a) b) c) d) e) 3. (4 pts) What is the correct ordering of energies of π -MOs in benzene, shown below? A B C D E F a) D < B = E < C = F < A b) D < B < C = E < F < A c) D < B = C < E = F < A d) D < B = C < A < E = F e) D < E = F < B = C < A 4. (4 pts) The alkyl-alkyl eclipsing interaction in pentane introduces 11 kJ/mol of strain, and the hydrogen-alkyl eclipsing interaction contributes 6 kJ/mol of strain. What is the height of the largest rotational barrier in pentane (counting from the zero-strain reference point)?
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Exam 1 - Fall 2003 - Organic Chemistry Chem 38 Practice...

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