Assign the major diagnostic IR peaks for your carboxylic acid with the corresponding functional group. You must include a description of its strength (weak =w; medium = m; strong = s) and shape (sharp = sh; broad = br) (e.g., C=O: ~1600 cm-1, s sh). Include a copy of your IR in your report Draw the structure of your carboxylic acid and label unique hydrogen atoms with a different letter. You are not required to assign specific aromatic signals to their respective nuclei, and can report these as "aromatic protons." For example, ethanol would then be assigned as: 3.69 ppm (2H, Hb), 2.61 ppm (1H, Ha), 1.23 ppm (3H, Hc).
a. C=O stretch: ~1700 cm⁻1, s sh
b. O-H stretch: ~2500-3000 cm⁻1, br
c. C-H stretch (alkyl group): ~2800-3000 cm⁻1, m
