Substituenteffecten op de zuurgraad van carbonzuren

The acidity of substituted carboxylic acids varies depending on the stability of their conjugate base—carboxylate anions.

An electron-withdrawing substituent on the α carbon reduces the electron density to stabilize the carboxylate anion, and increases the strength of the acid.

The presence of multiple electron-withdrawing groups magnifies the inductive effect, further increasing the acidity.

Increased distance between the electron-withdrawing substituents and the –COOH group diminishes the inductive effect. Thus γ-substituted carboxylic acids are less acidic than α-substituted.

In contrast, an electron-donating substituent destabilizes the carboxylate anion, making them less acidic than the unsubstituted acids.

Aromatic carboxylic acids are more acidic than aliphatic carboxylic acids due to the electron-withdrawing effect of the aryl ring. Further, the presence of electron-withdrawing or electron-donating substituents alters their acidity.

In dicarboxylic acids, one –COOH group exhibits electron-withdrawing effect over the other, resulting in higher acidity of the first –COOH group compared to the second. This difference is reduced as the inductive effect decreases with the increa