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old Final Exam - 1 Circle the correct answer(100 pts(1...

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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: (3) The hydroxyl group of an alcohol can be converted into a good leaving group by treating with: (4) Which compound would NOT be expected to show intense IR absorption at 1715 cm -1 ? (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: 1 H is much larger than that of 13 C. (7) Conjugated dienes are more stable than isolated alkenes because of:
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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? (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:
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