Expert answer:Chemistry Lab
Solved by verified expert:Answer all the questions in the work sheet
worksheet_ir.pdf
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IR Worksheet – CHEM 2460
Spectrum A – F are the IR spectra of the compounds shown. In Spectrum A – F, assign the
major absorptions above ~1500 cm-1 in the spectrum of each compound, (using Tables 8.1
and 8 2 [see background information]).
A. IR spectra of phenylethyne
B. IR spectra of n-butyl acetate
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C. IR spectra of N,N-dimethylacetamide
D. IR spectra of diethyl ether (Also assign the peak at 1110 cm-1)
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E. IR spectra of benzonitrile
F. IR spectra of N-methylaniline
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In the following assignment, identify the key functional groups in the given IR spectra. For
each spectra, determine the compound from the spectra and molecular formula. (Hint:
Calculate the unsaturation number and use this information to limit the possibilities of the
constitutional isomers.)
I.
Spectrum I: C3H6O (Hint: Not an aldehyde.)
3000 cm
-1
1711 cm
-1
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II.
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Spectrum II: C2H6O
1045 cm
-1
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The following pages will help you assign your spectrum.
(You DO NOT need to print page below!)
Where #C is number of carbons in the molceular formula, #N is number of nitrogens in the molceular formula, #X is
number of halogen atoms in the molceular formula, and #H is number of hydrogens in the molceular formula.
≡
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