Final answer:
The IR spectrum for esters typically shows a strong absorption peak in the carbonyl region (1650-1750 cm¹) and additional peaks in the fingerprint region (400-1400 cm¹).
Step-by-step explanation:
The IR spectrum for esters typically shows a strong absorption peak in the range of 1650-1750 cm¹. This peak is due to the carbonyl functional group in the ester molecule. Within this range, the specific location of the peak can provide more information about the ester's structure. Carboxylic acids, esters, ketones, and aldehydes tend to absorb at the higher end of this range (1700-1750 cm-1).
Additionally, the longer-wavelength region (400-1400 cm-1) of the IR spectrum, known as the fingerprint region, contains valuable information that can be used for identifying unknown compounds. The unique pattern of absorbance peaks in this region can be compared to the IR spectra of known standards to make a positive identification.
Overall, the IR spectrum for esters is characterized by a strong peak in the carbonyl region and additional peaks in the fingerprint region.