What is infrared spectroscopy used for in organic chemistry?
Infrared spectroscopy is used to identify the functional groups present in organic molecules.
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What are the axes labels in an infrared spectrum?
The x-axis is labelled wavenumber, measured in units of cm-1.
The y-axis is labelled transmittance, measured as a percentage.
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What is the fingerprint region in an infrared spectrum?
The fingerprint region is below 1,500 cm-1 and it contains unique peaks which can be used to identify the particular molecule under investigation.
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What is the key absorbance peak in the IR spectrum of an alcohol?
The key absorbance peak in the IR spectrum of an alcohol is within the range 3, 300 - 3,600 cm-1 caused by the O-H bond.
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What is the key absorbance peak in the IR spectrum of an aldehyde or ketone?
The key absorbance peak in the IR spectrum of an aldehyde or ketone is within the range 1650 - 1850 cm-1 caused by the C=O bond.
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What are the key absorbance peaks in the IR spectrum of a carboxylic acid?
The key absorbance peaks in the IR spectrum of a carboxylic acid are within the range 1,650 - 1,850 cm-1 caused by the C=O bond, and a broad peak at 2,400 - 3,300 cm-1 caused by the O-H group.
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What happens to the covalent bonds in molecules when they absorb infrared radiation?
They increase their vibrational motion.
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