I did an 1H-NMR on propan-2-ol and found a doublet for the OH proton at 4.88ppm, but the NMR database did not show a peak for OH. When checking another database, the OH peak was shown as a singlet at 2.2ppm. The solution explains that OH proton peaks can appear anywhere from 2-5ppm and may not always appear due to exchange with solvent. They typically show as broad singlets.

1. I did 1H-NMR on propan-2-ol, and found a doublet at 4.88ppm, corresponding to the proton on
the OH functional group, but when viewing NMRDB.org, they don't seem to show a peak for
the OH at all. When viewing the peak on the Integrated Spectral Database System of Organic
Compounds, the peak can instead be seen at 2.2ppm, and it appears as a singlet. Why is this?
Solution
Peak for the -OH proton do not come at a specific position in the NMR. They may appear
anywhere in the spectrum mostly between 2-5 ppm range. The peak also does not appear
sometimes and the -OH proton is easily exchangeble in the solution. Therefore, they appear
mostly as a broad singlet in the 1H NMR.