Compare the acidic strength of p hydroxybenzoic acid and salicylic acid
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4-Hydroxybenzoic acid has a pKa of 4.54. The hydroxyl group, whether ortho or para, is resonance electron-donating. ... This removes electron density from the carboxylic acid, making its hydrogen more acidic. In the structures below, the hydrogen bond in salicylic acid is shown by a dotted line.
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