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What is the correct order of acidity of salicylic acid, 4-hydroxybenzoic acid, and $2,6-$ dihydroxybenzoic acid?
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2,6-dihydroxybenzoic acid > salicylic acid > 4-hydroxybenzoic acid
The conjugate base of 2, 6-dihydroxybenzoic acid is highly stabilised by $\mathrm{H}$-bonding. The effect is lesser in salicyclic acid.
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