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c =
· c/=
· is proportional to 1/
· = wavelength
· 1/ = wavenumber cm-1…read more

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Bond Location Wavenumber/cm-1
C=O Aldehydes 1720 ­ 1740
Ketones 1705 - 1725
Carboxylic acids 1700 ­ 1725
Esters 1735 ­ 1750
O-H Alcohols, phenols 3600 ­ 3640
Carboxylic acids 2500 ­ 3200…read more

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Why do different groups absorb
different frequencies?
· Energy needed to cause the bond to
vibrate depends on the bond strength.
· The energy causes bonds to bend and
stretch in different ways.…read more

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What do the spectra look like?…read more

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