Carboxylic acid
2.5 -5
Phenol
9-10
Aromatic amine
2-5
Tetrazole
4.5-6
Sulfonamide
5-10
Sulfonylurea
5-6
B-di carbonyl
4.5 - 8.5
Imide
4.5 - 8.5
Sulfonic acid
1-2
Phosphonic Acid
1st - 1.5-2.5
2nd - 6.5 - 7.5
Imine
3-4
Amidine
10-11
Guanidine
12-13
Hydrazine
7.5 - 8.5
Heterocyclic nitrogen
1-5
Amine
9-11