In proton NMR spectroscopy, which compounds or functional groups show a characteristic peak in the range 9-10 ppm?
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Correct Answer: B. Aldehydes
Nuclear magnetic resonance (NMR) is concerned with the magnetic properties of certain nuclei. Anything that removes electron density from around a nucleus deshields it and shifts the absorption to higher frequency. The more electronegative the atoms that are attached to the nucleus, the higher the absorption frequency. Thus, NMR is able to provide information on the types of functional groups present as each has a characteristic chemical shift range. Aldehydes have a very characteristic shift of 9-10 ppm.
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