Answer Key to the practice problems for Exam 1

Answer Key to the practice problems for Exam 1 - Practice...

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Practice problems for Exam 1 1. Do all homework and quiz problems related to Chapters 12-15 2. Describe the characteristic IR absorption frequencies that would allow you to distinguish between the following pairs of compounds. Give your reasoning .    MeO 2 CC 1 O O and iv) H 3 C CO 2 Me C CO 2 Me and i) ii) iii) NH 2 O and H O and v) H 3 CH 2 C H CH 3 H 3 C H 3 C H 3 C CH 3 O O and No or very weak vibration (signal) ~ 3,300 cm -1 C=C ~1,600 cm -1 aromatic; fully conjugated; weaker C=C and C=O and C=O lower C=C ~1,680 cm -1 C=O ~1,640 cm -1 ~1,690 cm -1 conjugated C=O weaker C=O C=O lower ~1,640 cm -1 ~1,700 cm -1 C=O ~1,730 cm -1 ~1,700 cm -1 increased ring strain increased electron density on C=O stronger C=O C=C higher ~1,680 cm -1 C=C No
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6. The five compounds shown below have different 13-C NMR spectra. Match the structures with the correct spectra by placing the letter of the specific compound in the box. CH 3 CH 3 H 3 C OH OH O O A B C D O O E Appears downfield; the carbon should have a neighboring electron withdrawing element 3
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7. Sketch your prediction of
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Answer Key to the practice problems for Exam 1 - Practice...

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