old Final Exam

Old Final Exam - 1 Circle the correct answer(100 pts(1 Which of the following reagents is NOT typically viewed as a reducing agent a BH3 b LiAlH4 c

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2 1. Circle the correct answer: (100 pts) (1) Which of the following reagents is NOT typically viewed as a reducing agent? a. BH 3 ; b. LiAlH 4 ; c. Zn-HCl d. H 2 O; e, NaBH 4 Answer: d (2) The nucleophilicity of alcohols can be enhanced by deprotonation with: a. strong bases. b. strong acids. c. salts. d. electrophiles. Answer: a (3) The hydroxyl group of an alcohol can be converted into a good leaving group by treating with: a. TsCl/pyridine; b. HCl; c. heating d. cooling Answer: a and/or b (4) Which compound would NOT be expected to show intense IR absorption at 1715 cm -1 ? a. (CH 3 ) 2 CHNH 2 ; b. CH 3 COCH 3 ; c. ethyl acetate d. (CH 3 ) 2 CHCOOH Answer: a (5) Which compound would show an M and M+2 peaks of about equal intensity? a. CH 3 CH 2 CH 2 CH 3 ; b. CH 3 NH 2 ; c. CH 3 CH 2 Br d. CH 3 (CH 2 ) 2 CH 3 Answer: c (6) 1 H NMR is more sensitive than 13 C NMR because: a. the of mass hydrogen is only 1/12 of that of carbon; b. 12 C is magnetically inactive; c. 13 C spectra do not overlap with 1 H spectra. d. the natural abundance of 1 H is much higher than that of 13 C and the magnetogyric ratio of 1 H is much larger than that of 13 C. Answer: d (7) Conjugated dienes are more stable than isolated alkenes because of: a. Hybridization of their carbons. b. Delocalization of their pi electrons. c. Increased dipole moment. d. Coplanarity of all of their hydrogens. Answer: b
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3 (8) In the proton NMR, in what region of the spectrum does one typically observe hydrogens bound to the aromatic ring? a. 1.0 – 1.5 ppm b. 2.0 – 3.0 ppm c. 4.5 – 5.5 ppm d. 7.0 - 8.0 ppm e. 9.0 – 10.0 ppm Answer: d (9) Compared to benzene, acetophenone (C 6 H 5 COCH 3 ) absorbs UV radiation at longer wavelength because of: a. high stability. b. higher boiling point. c. conjugation. d. planar structure. e. higher molecular weight. Answer: c (10) The sigma complex that forms as an intermediate in electrophilic aromatic substitution is: a. aromatic. b. antiaromatic. c. non-aromatic. d. more aromatic. e. less aromatic. Answer: c (11) The major organic product from the reaction between benzene and n -butyl bromide (CH 3 CH 2 CH 2 CH 2 Br) in the presence of FeBr 3 is: a. benzoic acid b. n-butylbenzene c. tert -butylbenzene d. butanol and benzene e. nothing Answer: c (12) The hybridization of the nitrogen of aniline (C 6 H 5 NH 2 ) is a. sp 2 . b. sp 3 . c. sp. d. between sp 2 and sp 3 . e. s 3 p 2 . Answer:
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This note was uploaded on 11/10/2010 for the course CHE 201 taught by Professor Bong during the Spring '08 term at SUNY Buffalo.

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Old Final Exam - 1 Circle the correct answer(100 pts(1 Which of the following reagents is NOT typically viewed as a reducing agent a BH3 b LiAlH4 c

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