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drill_set2 - 5.13 Drill Problems for 9/17/03-9/24/03...

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5.13 Drill Problems for 9/17/03-9/24/03 Disclaimer: I apologize for the fact that some of my problems contain metals; I just couldn’t resist. However, these problems are supposed to enrich your ever-growing knowledge of chemistry, so that’s my excuse. --NM IR Spectroscopy Order the following from highest to lowest frequency (cm -1 ) with the respect to the indicated vibration. 1. C=C stretch in a) 1-butene, b) 2-butene 2. CO stretch in a) methanol, b) carbon monoxide, c) formaldehyde 3. X-Cl stretch: a) C-Cl, b) Fe-Cl 4. C-H stretch in a) C 2 H 6 , b) C 2 H 4 , c) C 2 H 2 13 C NMR NMR data can give insight into the distribution of electron density in a molecule. 1. Rank the following according to your expectation of increasing 13 C chemical shift (ppm): a) MeLi, b) MeMgBr, c) Me 3 Al 2. Based solely on the following trend in 13 C chemical shift in ppm (which may or may not be true), rank H, Zn(II), and Cu(II) in order of increasing ability to stabilize a positive charge: O O O H ZnCl
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This note was uploaded on 03/02/2012 for the course CHEM 512 at MIT.

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drill_set2 - 5.13 Drill Problems for 9/17/03-9/24/03...

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