IR peak

Band wave number (cm⁻¹)

Assigned functional group

RBS

BABS

AABS

1

3889.63

3287.10

3327.12

O-H stretching vibration of alcohol or carbonyl acid

2

2918.26

2920.86

2918.94

C-H stretching vibration of alkane

3

2184.23

2541.21

2209.05

C-H stretching of alkyne

4

1916.51

C-O stretching vibration of alkene and ketones

5

1636.18

1604.94

1628.34

C-H stretching of alkene

6

1029.54

897.33

660.63

CH bending vibration of C-H₂ and C-H₃ (finger print region)