Explain the differences in the
infrared spectra shown below for acetic acid in solution and in the
gas phase. Comment on the reasons for the changes in position and
intensity of carbonyl and hydroxyl stretch bands. Why do you think
the gas phase acetic acid band at 1790 cm-1 appears as a
doublet? 
(b) The gas phase spectrum of
trifluoroacetic acid is shown below. Explain why the carbonyl band
is now found at a higher wavenumber position of 1825
cm-1. What is the fingerprint region, and why is less
useful for functional group analysis? Suggest a strategy that could
be used to assign all the bands of CF3COOH, including
those in the fingerprint region
Show transcribed image text O.8 – 0.4 O.2 CH, COOH E (10% in CCI4 solution) OOO 2 OOO OOO avenumber (cm-1) O. 8 O. 6 CHCOOH (gas phase) o. 4 o. 2 2OOO 1 OOO 200 Wavenumber (cm-1)
O.8 – 0.4 O.2 CH, COOH E (10% in CCI4 solution) OOO 2 OOO OOO avenumber (cm-1) O. 8 O. 6 CHCOOH (gas phase) o. 4 o. 2 2OOO 1 OOO 200 Wavenumber (cm-1)
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