Peak No.

Wave number (cm⁻¹)

Tentative assignment

1

1086

C-O stretching

2

1628

C=C stretching

3

1725

C=O

4

2362

CO₂ stretching

5

2825 - 3050

Aliphatic and Aromatic C-H stretching

6

3100 - 3600

Broad band for O-H stretching and H-bonding