Alcohols have a fairly broad feature between 3200 and 3500 cm-1 but no feature near 1700 cm-1.

Aldehydes and ketones have a feature near 1700 cm-1 but no significant features in the 2500 to 3500 cm-1 region.

Carboxylic acids have a very broad feature between 2500 and 3300 cm-1 and a feature near 1700 cm-1.

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