C—H

R₂CH₂

1.07

Aromatic

1.08

RCH₃

1.10

C—C

Hydrocarbon

1.54

Aromatic

1.40

C=H

Ethylene

1.33

C≡C

Acetylene

1.20

C—N

RNH₂

1.47

O=C—N

1.34

C=O

Alcohol

1.43

Ester

1.36

C—O

Aldehyde

1.22

Amide

1.24

C—S

R₂S

1.82

N—H

Amide

0.99

O—H

Alcohol

0.97

O—O

O₂

1.21

P—O

Ester

1.56

S—H

Thiol

1.33

S—S

Disulfide

2.05