Question

The following list of frequency ranges (in wavenumbers) are those that correspond to four most important regions of the IR spectrum. For each region indicate the most important structural information that it indicates.

Region 3: 1750-1630 cm⁻¹

Answer 1

The 1750-1630 cm⁻¹ region in the IR spectrum primarily provides information about the presence and type of carbonyl functional groups in a molecule.

Step-by-step explanation:

In the IR spectrum, each region corresponds to different types of vibrational motions in molecules. In the region spanning 1750-1630 cm⁻¹, the most important structural information one can infer relates to the presence of certain functional groups. Particularly, this region is known for the carbonyl stretch. Carbonyl groups are part of several organic compounds such as ketones, aldehydes, carboxylic acids, and amides. The exact position and shape of the peak can give us more detailed information, such as the type of carbonyl-containing group and whether it is conjugated with other double bonds or part of a ring system.