OCHEM2 Exam1A

OCHEM2 Exam1A - 2 /CCl 4 solutions. B) The compound rapidly...

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Name: __________________________ Date: _____________ 1. Which hydrogen atom(s) of is/are most susceptible to abstraction by free radicals? A) I B) II C) III D) IV E) V 2. Estimate the stabilization energy for 1,3-butadiene using the heats of hydrogenation in Table 1. A) 13 kJ mol -1 B) 15 kJ mol -1 C) 28 kJ mol -1 D) 239 kJ mol -1 E) 112 kJ mol -1 3. Application of the polygon-and-circle technique reveals that single electrons occupy each of the two nonbonding orbitals in the molecular orbital diagram of: A) Cyclobutadiene B) Benzene C) Cyclopropenyl cation D) Cyclopentadienyl anion E) Cycloheptatrienyl cation Page 1 1-Pentene 1 -126 1,3-Butadiene 2 -239 1,3-Pentadiene 2 -226 Table 1. Heats of Hydrogenation for Selected Compounds Compound Moles H 2 H(kJ mol -1 ) 1-Butene 1 -127
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4. Which of the following statements about cyclooctatetraene is NOT true? A) The compound rapidly decolorizes Br
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Unformatted text preview: 2 /CCl 4 solutions. B) The compound rapidly decolorizes aqueous solutions of KMnO 4 . C) The compound readily adds hydrogen. D) The compound is nonplanar. E) The compound is comparable to benzene in stability. 5. Recalling that benzene has a resonance energy of 152 kJ mol-1 and naphthalene has a resonance energy of 255 kJ mol-1 , predict the positions which would be occupied by bromine when phenanthrene (below) undergoes addition of Br 2 . A) 1, 2 B) 1, 4 C) 3, 4 D) 7, 8 E) 9, 10 6. The major product(s), B, of the following reaction, would be: A) I B) II C) III D) Equal amounts of I and II E) Equal amounts of I, II and III Page 2 7. How might the following synthesis be carried out: A) B) C) D) E) None of these syntheses is satisfactory. Page 3 Answer Key 1. D 2. B 3. A 4. E 5. E 6. C 7. C Page 4...
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OCHEM2 Exam1A - 2 /CCl 4 solutions. B) The compound rapidly...

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