| No | Wave number (cm−1) | Functional groups |
| 1 | Near 500 (intensive) | -C-I |
| 2 | Near 690 | -CH=CH-(cis-) |
| 3 | 890 - 820 (extremely weak) | Alkyl peroxide |
| 4 | 1150 - 1060 (extremely weak) | Alkyl ethers |
| 5 | 1250 ± 5 (intensive), near 1250 - 1200 (intensive) | (CH3)3-C-R |
| 6 | 1340 - 1250 (intensive) | Secondary aromatic amines |
| 7 | 1610 - 1550 (intensive) 1420 - 1300 (intensive) | -COO- |
| 8 | 1465 - 1340 | C-H alkanes with flexural vibration |
| 9 | 1685 - 1665 | -CH=CH-CO- |
| 10 | 2440 - 2350 (medium) | P-H |
| 11 | 3000 - 2850 | CH alkanes with stretching vibration |
| 12 | 3030 - 2500 a series of continuous bands (weak) | Amino acid hydrochloride |