Table 3. IR Band Assignment for the Various Functional Groups.
| wavenumber range (cm–1) | selected wavenumber (cm–1) | nature | functional group |
|---|---|---|---|
| 2970–2950 | 2968, 2920 | symmetric and asymmetric stretching of methyl and methylene groups | alkanes |
| 2935–2915 | |||
| 3040–3010 | 3018 | C–H stretching of alkene groups | alkenes |
| C=C stretching of alkene groups | |||
| 3130–3070 | 3079 | C–H bending of aromatics | aromatics |
| C=C stretching of aromatics | |||
| 1750–1680 | 1705 | carbonyl (C=O) groups | ketones and aldehydes |
Adapted with permission from ref (15). Copyright 2017 Elsevier.