Chem 335 - Winter 2002
Organic Chemistry II
Dr. Carl C. Wamser
In order to do this pre-quiz, you must log in to the class WebCT site.
This pre-quiz must be submitted via WebCT before Wednesday morning, January 9, 8:30 am.
1. To determine the molecular weight of an unknown compound, the most appropriate technique would be
1) H(1)-NMR
2) C(13)-NMR
3) UV
* 4) MS
5) IR
2. Which of the following compounds would show a single peak in proton NMR?
* 1) ethane
2) propane
3) butane
4) isobutane
5) none of the above
3. TMS is chosen as the standard reference for NMR spectra for all of the following reasons EXCEPT
1) it is a singlet
2) it has a large number of equivalent hydrogens
3) it absorbs at a relatively unique chemical shift
4) it is soluble in most organic solvents
* 5) it absorbs far downfield of most organic compounds
4. In C-13 NMR, which of the following would give only one peak?
1) benzene
2) cyclopropane
3) ethene
4) ethane
* 5) all of the above
5. The presence of a strong infrared peak at 1700 cm-1 would be most consistent with
1) an alkene
2) an aromatic
* 3) a ketone
4) an alcohol
5) an alkyl halide