POD02Key - –1 is consistent with the presence of a...

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Problem of the Day #02 – Answer Key Deadline : IN CLASS ON Th 7/15/2010 LATE WORK WILL NOT BE ACCEPTED OR GRADED!!! This problem is worth a total of 20 raw points. Each part is worth 10 points. In each part below, an infrared spectrum is shown. To the right of each spectrum, four structures are given. Circle the structure of the compound that produced the IR spectrum. You will earn 6 points for circling the correct structure. To earn the remaining 4 points for each part, explain briefly how you arrived at your answer (the amount of space provided should be enough for a suitable explanation). (a) Explanation : (b) Explanation : 4000 3000 2000 1500 1000 500 4000 3000 2000 1500 1000 500 O O OH O O OH O OCH 3 O O OH H O The strong absorption near 1700 cm
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Unformatted text preview: –1 is consistent with the presence of a carbonyl group (C=O). Since a strong, broad absorption centered near 3300 cm –1 is absent, the molecule does not contain a hydroxyl group (O–H bond). The circled molecule is the only structure that contains a carbonyl group and does not contain a hydroxyl group. There is no strong absorption near 1700 cm –1 that is consistent with the presence of a carbonyl group (C=O). Since a strong, broad absorption centered near 3300 cm –1 is absent, the molecule does not contain a hydroxyl group (O–H bond). The circled molecule is the only structure that neither contains a carbonyl group nor a hydroxyl group....
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