sp CH sp2 CH sp3 CH Aromatic CH OH C=CC≡C ... AWS

Functional Group

Typical IR Range (cm-1)

sp C-H sp2 C-H sp3 C-H

3300

Aromatic C-H

3030

O-H

3200-3550 (Alcohols) 2500-3000 (Carboxylic acids)

C=C

1620-1680 (Alkene) 1400-1600 (Aromatic)

3100 2900

O

C≡C N-H

C=O

2100-2260 OH

3300-3500 1690-1740 (Aldehyde) 1680-1750 (Ketone) 1735-1750 (Ester) 1710-1780 (Carboxylic acid) 1630-1690 (Amide)

Strong Medium Weak/Variable