CHE202A - Past Final Exam Key

CHE202A - Past Final Exam Key - 1. Circle the correct...

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2 1. Circle the correct answer: (60 pts) (1) Which of the following reagents is NOT typically viewed as an oxidizing agent? a) H 2 O 2 ; b) H 2 O; c) O 3 d) O 2 ; e) NaIO 4 (2) Which of the following reagents is the best choice for converting acid chlorides into ketones? a) LiAlH 4 ; b) NaBH 4 ; c) LiAlH[OC(CH 3 ) 3 ] 3 ; d) (CH 3 ) 2 CuLi (3) What compound is produced when acetyl chloride is treated with water? a) sodium acetate. b) acetic anhydride. c) acetic acid. d) methyl acetate. (4) The electrophilicity of aldehydes or ketones can be enhanced by protonation with: a) strong bases. b) strong acids. c) salts. d) water. (5) Which compound would be expected to show intense IR absorption at 1715 cm -1 ? a) (CH 3 ) 2 CHNH 2 ; b) CH 3 COCH 3 ; c) CH 3 CH 2 OH d) CH 3 OCH 3 (6) Which of the following possesses the most acidic hydrogens? A. B. C. D. E. (7) Electromagnetic raditation in the region is used in 1 H NMR spectroscopy. a) radio wave; b) ultraviolet; c) infrared; d) microwave; e) X-ray (8) Compared to alcohols of the same mass, ethers have much lower boiling points because of a. The difference in their molecular weights. b. The difference in their dipole moments. c. The difference in their molecular formulas. d. The difference in H-bonding. (9) In the electrophilic addition of HX to the π -bonded system of a conjugated diene, 1,2- and 1,4- addition involve: a. completely different pathways. b. two or more bonding molecular orbitals in the π system.
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3 c. allylic and vinylic structures within the molecule. d. the same resonance-stabilized carbocation intermediate. e. different resonance-stabilized carbocation intermediate. (10) In electrophilic aromatic substitution, what groups attached to the aromatic rings have the
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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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CHE202A - Past Final Exam Key - 1. Circle the correct...

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