1. The problem statement, all variables and given/known data I'm having a hard time understanding spectral data. It says that there is a compund with a sharp IR between 1700 and 1720 cm-1 and a strong broad absorption over the region 2500-3000 cm-1. 1H NMR: 2.49 (t, 2H), 2.80 (t, 2H), 3.72 (s, 3H), 6.78 (d, 2H), 7.11 (d, 2H), 12.40 (s, 1H). 13C NMR: 173.89, 157.57, 132.62, 128.99, 113.55, 54.84, 35.75, 29.20. How do you interpret this or is there a place that you can go to on the web to find out what structure you have that I missed? 2. Relevant equations 3. The attempt at a solution sharp IR between 1700 and 1720 cm-1 (this is a carbonyl C=O of an acid) and a strong broad absorption over the region 2500-3000 cm-1 (this is an O-H group).