Compound A in the box represents alcohol and compound B represents aldehyde.
The infrared frequency range that represents alcohol is 3.3 micrometers to 3.4 micrometers. This range of frequencies is determined by the absorption of infrared radiation by alcohol molecules. The molecules absorb radiation at this wavelength and cause a decrease in the intensity of radiation, which is then measured by a spectrometer. This can then be used to identify the presence of alcohol in a sample.
The Aldehyde group has a characteristic vibrational frequency of 1,639 cm−1 in the infrared spectrum. This frequency falls in the range of 1,400–1,800 cm−1 and is part of the C=O stretching vibration of the aldehydic group in compounds. This frequency is used to identify the presence of aldehydes in a sample.
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