CHE202 - Exam 2 Answers

CHE202 - Exam 2 Answers - CHE 202B/204B Exam 2 Student Name...

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CHE 202B/204B Exam 2 03-28-09 Student Name: ANSWER KEY Student #: Please have your Student ID ready. Score Card FOR GRADERS ONLY Part A (50 pts) = -------------------- Part B (30 pts) = -------------------- Part C (30 pts) = -------------------- Part D (40 pts) = -------------------- Bonus ( 10 pts) = -------------------- Total (150 points) =--------------- Answer Questions 1-20 in the grid below (50 points)- Please mark an X in the appropriate box Incorrectly completed answer grid will not be graded A B C D 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
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CHE 202B/204B Exam 2 03-28-09 Please answer all questions IN THE ANSWER GRID-PAGE 1 Part A (20 X 2.5 =50) 1) In electrophilic aromatic substitution reactions, a methoxy substituent on the aromatic ring is: A) a deactivator and a m-director. B) a deactivator and an o,p-director. C) an activator and a m-director. D) an activator and an o,p-director. 2) Which of the following is true of benzene? A) Benzene tends to undergo addition rather than substitution reactions. B) All of the hydrogen atoms of benzene are equivalent. C) The carbon-carbon bonds of benzene are alternately shor t and long around the ring D) The benzene ring is a distorted hexagon. 3) 1,3-Pentadiene has how many bonding molecular orbitals? A) 1 B) 2 C) 3 D) 4 4) How many pairs of degenerate π molecular orbitals are found in [8]annulene? A) 4 B) 1 C) 2 D) 3 5) Which of the following dienes would you expect to be the most stable? A) CH 3 CH 2 CH=CHCH 2 CH=CHCH 3 B) CH 3 CH=CHCH=CHCH 2 CH 3 C) CH 2 =CHCH 2 CH 2 CH 2 CH=CH 2 D) CH 2 =CHCH=CHCH 2 CH 2 CH 3 6) On the basis of molecular orbital theory and Huckel's rule, which of these compounds should be aromatic? I II III IV A) I. B) II C) III D) IV 7) Which of the following is the strongest activating group in electrophilic aromatic substitution reactions?
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CHE202 - Exam 2 Answers - CHE 202B/204B Exam 2 Student Name...

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