13.The following molecule contains how many units of unsaturation? FO A)1B)2C)3D)4E)5 Ans:C A)C=O B)C=C C)OH D)NH E)C Ans:E 16.Under specialreaction conditions.-pinene and B-pine e can be i CH, a-pinene B-pinene The a-isomer will predominate. The B-isomer will predominate. The isomers would be equally favored. Ans:A 17.The greatest strength of infrared spectroscopy is in determining A) the degree of unsaturation. the relationships of structural fragments. the functional groups present. the overall structure of the molecule. Ans rings are present. 18.How many degrees of unsaturation are present in the following molecule? C14H13FN20 A)3B)5C)7D)8E)10 Ans:D Page5Page 5 13. The following molecule contains how many units of unsaturation? O A) 1 B) 2 C) 3 D) 4 E) 5 Ans: C 14. What functional group would be indicated by an IR absorption at 2150 cm–1? A) C=O B) C=C C) OH D) NH E) C C≡ Ans: E 15. What functional group would be indicated by an IR absorption at 1650 cm–1? A) C=O B) C=C C) OH D) NH E) C C≡ Ans: B 16. Under special reaction conditions, α-pinene and β-pinene can be in equilibrium (caused to interconvert reversably). Using your knowledge of alkene stability, which of the following would be true at equilibrium? CH3 CH2 α-pinene β-pinene A) The α-isomer will predominate. B) The β-isomer will predominate. C) The isomers would be equally favored. D) A third isomer would predominate. E) None of the above is true. Ans: A 17. The greatest strength of infrared spectroscopy is in determining A) the degree of unsaturation. B) the relationships of structural fragments. C) the functional groups present. D) the overall structure of the molecule. E) if rings are present. Ans: C 18. How many degrees of unsaturation are present in the following molecule? C14H13F3N2O A) 3 B) 5 C) 7 D) 8 E) 10 Ans: D