CHE202 - Exam 1 Answers

CHE202 - Exam 1 Answers - CHE 202B/204B EXAM 1 Feb 14, 2009...

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CHE 202B/204B EXAM 1 Feb 14, 2009 Student Name: Student #: Please have your Student ID ready. Answer Questions 1-16 in the grid below (48 points) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 A B C D Score Card GRADING PURPOSE ONLY Part A (48 pts) = --------------------- Part B (30 pts) = --------------------- Part C (42 pts) = --------------------- Part D (30 pts) = --------------------- bonus (10 pts) = ---------------------- Do 1 extra problem from Part D Total (150 points) = ______________________________ 1
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CHE 202B/204B EXAM 1 Feb 14, 2009 Part A Answer all questions on the answer sheet on page 1 (16 questions, 3 pts each) 1) Which bond would be expected to show the lowest frequency for an IR absorption? A) C-C stretch B) a C-O stretch C) a C-H stretch D) a O-H stretch 2) Deduce a possible structure for the compound with the IR absorptions below. 3030, 2950, 2250, 1600 cm -1 A) C 6 H 5 C N B) CH 3 CH 2 CH 2 CHO C) HC CCH 2 Br D) CH 3 C CCH 3 3) Which pair of reagents would produce the highest yield of ( S )-2-pentoxybutane? A) potassium ( S )-2-butoxide + iodopentane B) potassium ( R )-2-butoxide + iodopentane C) potassium pentoxide + ( S )-2-iodobutane D) potassium pentoxide + ( R )-2-iodobutane 4) In IR spectroscopy, the C–D bond has a __________ frequency than the C–H bond because __________. A) higher, an H atom has more electronegativity than an D atom B) lower, a H atom has less mass than an D atom C) higher, an D atom has more mass than an H atom D) lower, an D atom has more electronegativity than an H atom 5) An Alkyl halide shows a three signals in the NMR spectrum at δ 0.9 (6H, d), 1.1 (1H, m) and 3.6 (2H, d) these are likely due to the fragments ---------. A) CH 3 CH 2 -X B) (CH 3 ) 2 CHCH 2 -X C) (CH 3 ) 2 CH-X D ) CH 3 CH 2 CH 2 CH 2 - X 6) When hexan-1-ol is treated with conc. H 2 SO 4 at moderate temperatures, __________ is formed via a(n) __________ mechanism. A) di- n -hexyl ether, S N 2 B) di- n -hexyl ether, S N 1 C) di- n -hexyl ether, E2 D) di- n -propyl ether, E1 7) When a compound contains a Nitrogen atom, its __________ peak is an _______ number. A) M +2, even
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This note was uploaded on 10/10/2010 for the course CHE 202 taught by Professor Richard during the Spring '05 term at SUNY Buffalo.

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CHE202 - Exam 1 Answers - CHE 202B/204B EXAM 1 Feb 14, 2009...

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