| Functional Group | Absorption Location (cm−1) | Absorption Intensity |
| Alkane (C-H) | 2850 - 2975 | Medium to strong |
| Alcohol (O-H) | 3400 - 3700 | Strong, broad |
| Alkene (C=C) | 1640 - 1680 | Weak to medium |
| (C=C-H) | 3020 - 3100 | Medium |
| Alkyne |
|
|
| (C≡C) | 2100 - 2250 | Medium |
| (C≡C-H) | 3300 | Strong |
| Nitrile (C≡N) |
|
|
| Aromatics | 1650 - 2000 | Weak |
| Amines (N-H) | 3300 - 3350 | Medium |
| Carbonyls (C=O) |
| Strong |
| Aldehyde (CHO) | 1720 - 1740 |
|
| Ketone (RCOR) | 1715 |
|
| Ester (RCOOR) | 1735 - 1750 |
|
| Acid (RCOOH) | 1700 - 1725 |
|