CHE202 - Practice Final Exam Answers

CHE202 - Practice Final Exam Answers - CHE 202B/204B Final...

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CHE 202B/204B Final Exam ( 250 points, 150 minutes ) Dr Khalid Ahsan PRACTICE EXAM Student Name: ANSWER KEY Student #: Please have your Student ID ready. Score Card FOR GRADERS ONLY Part A (60 pts) = -------------------- Part B (60 pts) = -------------------- Part C (60 pts) = -------------------- Part D (30 pts) = -------------------- Part E (40 pts) = -------------------- Bonus ( 10 pts) = -------------------- Total (150 points) =--------------- Answer Questions 1-20 in the grid below (60 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 Part A (20 X 3 = 60 points) 1/9
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CHE 202B/204B Final Exam ( 250 points, 150 minutes ) Dr Khalid Ahsan PRACTICE EXAM 1) In nucleophilic acyl substitution, : A) protonation of the carbonyl is followed immediately by loss of the leaving group. B) loss of the leaving group is followed by rearrangement of the carbocation. C) addition to the carbonyl by a nucleophile is followed by loss of the leaving group. D) ester hydrolysis is followed by deprotonation. E) an S N 2 reaction occurs. 2) Through what mechanims can a 1,2- chlorohydrin be converted into an epoxide? A) S N 1 B) S N 2 C) E2 D)Hoffmann elimination E) Diekmann condensation 3) How many electrons are present in the nonbonding π molecular orbital of the allyl cation? A) 0 B) 1 C) 2 D) 3 E) 4 4) Secondary amines react with the nitrosonium ion to generate: A) diazonium salts B) oximes C) N -nitrosoamines D) imines E) anilines 5) Which of the following undergoes S N 2 reaction with sodium methoxide most rapidly? A) PhCH 2 Br B) Ph 3 CBr C) PhCH 2 CH 2 Br D) PhBr E) PhCH 2 CH 2 CH 2 Br 6) In electrophilic aromatic substitution reactions the nitro group is: A) a m-director since it destabilizes the meta sigma complex more than the ortho, para. B)
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CHE202 - Practice Final Exam Answers - CHE 202B/204B Final...

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