Chapter 11practiceA

Chapter 11practiceA - 2. Which of the following alkenes of...

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2. Which of the following alkenes of the formula C 5 H 10 would you expect to be the least stable? A) B) C) D) E) Ans: C 3. What would be the organic product of the following reaction? C C Ph Br H 3 C H 3 C Ph H CH 3 O - Na + ? A) C C H Ph Ph H 3 C B) C C Ph H H 2 C H Ph C) C C H Ph H 3 C Ph D) C C H 3 C Ph Ph CH 3 E) none of the above Page 1
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Ans: E 4. What would be the proper name of the following? C C H CH 3 CH 2 CH 3 Cl A) ( Z )-3-chloro-2-pentene D) ( E )-3-chloro-3-pentene B) ( Z )-3-chloro-3-pentene E) cis -3-chloro-3-pentene C) ( E )-3-chloro-2-pentene Ans: C 5. Infrared spectroscopy relies on what phenomenon? A) electronic transitions D) molecular stretching and bending B) molecular rotations E) conformational interconversion C) nuclear alignments Ans: D 6. The IR spectrum of a compound shows a strong absorbance peak at 1720 cm –1 . What functional group is indicated? A) OH B) C=C C) NH D) C=O E) CN Ans: D 7. A hydrocarbon with the molecular formula C 7 H 12 exhibits the following spectroscopic data: 1 H NMR δ = 1.3 (m, 2H), 1.7 (m, 4 H), 2.2 (m, 4H), and 4.8 (quin, J = 3 Hz, 2H) ppm; 13 C NMR: δ = 26.8, 28.7, 35.7, 106.9, and 149.7 ppm. The IR spectrum has key absorbances at 3072, 2950, and 1649 cm –1 . Hydrogenation of the compound furnishes a product with the molecular formula C 7 H 14 . Which structure is consistent with this data? A) B) C) D) Page 2
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E) none of the above Ans: D 8. How many units of unsaturation are indicated by the following molecular formula: C 17 H 18 BrI 2 O 2 N ? A) 0 B) 2 C) 6 D) 8 E) 10 Ans: D 9. The following molecule contains how many units of unsaturation? HO O A) 2 B) 3 C) 5 D) 6 E) 7 Ans: E 10. Predict the major product of the following reaction: H 2 / Pd-C ? heat A) O B) C) D) Pd H H E) none of the above Ans: B Page 3
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11. Which of the following most accurately describes the IR fingerprint region: A) 2200 – 3400 cm –1 D) 1500 – 1850 cm –1 B) 600 – 1500 cm –1 E) 600 – 950 cm –1 C) 3000 – 3500 cm –1 Ans: B 12. Which of the following are of lowest energy? A)
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Chapter 11practiceA - 2. Which of the following alkenes of...

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