Type of Proton

Type of Compound

Chemical shift range (ppm)

RCH₃

primary aliphatic

0.9

R₂CH₂

secondary aliphatic

1.3

R₃CH

tertiary aliphatic

1.5

C=C-H

vinylic

4.6 - 5.9

C=C-H

vinylic, conjugated

5.5 - 7.5

C≡C-H

acetylenic

2 - 3

Ar-H

aromatic

6 - 8.5

Ar-C-H

benzylic

2.2 - 3

C=C-CH₃

allylic

1.7

HC-F

fluorides

4 - 4.5

HC-Cl

chlorides

3 - 4

HC-Br

bromides

2.5 - 4

HC-I

iodides

2 - 4

HC-OH

alcohols

3.4 - 4

HC-OR

ethers

3.3 - 4

RCOO-CH

esters

3.7 - 4.1

HC-COOR

esters

2 - 2.2

HC-COOH

acids

2 - 2.6

HC-C=O

carbonyl compounds

2 - 2.7

RCHO

aldehydic

9 - 10

ROH

hydroxylic

2 - 4

ArOH

phenolic

4 - 12

C=C-OH

enolic

15 - 17

RCOOH

carboxylic

10 - 13.2

RNH₂

amino

1 - 5