| 2960 - 2800 | Alkane (C-H) | [45] |
| 2956 - 2870 | C-H stretching in-CH3 groups | [40] |
| 2950 - 2850 | Aliphatic C-H,-CH2, -CH3 stretching | [52] |
| 2929 - 2860 | C-H stretching in-CH2 groups | [40] |
| 2926, 2855, 1455, 720 ± 10 | Aliphatic hydrocarbons CH2 | [12] |
| 2925 | −CH2 antisymmetric stretching | [50] |
| 2925, 2882, 2852, 2800 | Alkane | [24] |
| 2920 - 2850 | Aliphatic (C-H) | [16] |
| 2915 | -CH2 asymmetric stretching | [53] |
| 2860 - 2800, 2760 - 1200 | Aldehyde C-H stretch | [44] |
| 2860 - 2700 | Aldehydic hydrogen stretching | [54] |
| 2854 | −CH2 symmetric stretching | [50] |
| 2850 - 2700 | Aldehydic (C-H) | [12] |
| 2847 | −CH2 symmetric stretching | [53] |
| 2815, 2715 | CH stretching of aldehyde group | [8] |
| 2715 | Aldehydic stretching (C-H) | [9] |
| 2150 | Alkyne (C≡C) | [44] |
| 1870 - 1720 | Acid anhydrides (C=O) | [12] |
| 1850 - 1775 | C=O stretch in acid chloride | [44] |
| 1850 - 1650 (1640) | Carbonyl (C=O) | [16] [17] [19] [39] [53] |
| 1850 - 1640 | Non-acid carbonyl (C=O) | [29] [36] - [38] |
| 1850 - 1640 | Carboxylic acid (COOH) | [20] |
| 1850 - 1600 | Carbonyl functional group (C=O) | [12] |
| 1830 - 1800 | C=O stretch in anhydride | [44] |
| 1800 - 1670 | Carbonyl (C=O) | [30] [42] |
| 1775 - 1740 | C-O stretch in anhydride | [44] |
| 1762 | C=O in carboxylic acids and esters | [55] |
| 1750 - 1735 | Esters/Lactones (C=O) | [12] |
| 1750 - 1700 | C=O stretching in aldehyde, ketone, ester | [44] |
| 1750 - 1680 | Carbonyl (C=O) | [48] |
| 1748 - 1693 | Carbonyl (C=O) | [45] |
| 1743 | Ester C=O stretching | [50] |
| 1738 | Carbonyl (C=O) | [1] |