Bond

Location

Wavenumber/cm-1

Intensity

C-H

alkanes

2850-2950

Medium-strong

alkenes, arenes

3000-3100

Medium-strong

alkynes

around 3300

Strong

C=C

alkenes

1620-1680

Medium

C≈C

arenes

several peaks in range

Variable

1450-1650

C≡C

alkynes

2100-2260

Medium

C=O

aldehydes

1720-1740

Strong

ketones

1705-1725

Strong

carboxylic acids

1700-1725

Strong

esters

1735-1750

Strong

amides

1630-1700

Medium

C-O

alcohols, ethers, esters

1050-1300

Strong

C≡N

nitriles

2200-2260

Medium

C-F

fluoroalkanes

1000-1400

Strong

C-Cl

chloroalkanes

600-800

Strong

C-Br

bromoalkanes

500-600

Strong

O-H

alcohols, phenols

3600-3640

Strong

*alcohols, phenols

3200-3600

Strong (broad)

* hydrogen-bonded

*carboxylic acids

2500-3200

Medium (broad)

N-H

primary amines

3300-3500

Medium-strong

amides

around 3500

Medium