In infrared (IR) spectroscopy, carboxylic acids exhibit characteristic absorption bands that aid in their identification. The most prominent band is the C=O stretch in the range of 1680-1725 cm-1, indicating the presence of a carbonyl group. The broad O-H stretch at 2500-3300 cm-1 further confirms the carboxylic acid functional group. Additionally, the C-O stretch, observed between 1200-1300 cm-1, provides further evidence of the carboxylic acid structure. These characteristic bands, along with their closeness ratings, serve as valuable tools for identifying carboxylic acids in IR spectra.
