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Ethanoic acid: pKa = 4.76

Propanoic acid: pKa = 4.87

Fluoroethanoic acid: pKa = ‎2.59

Iodoethanoic acid: pKa = 3.18

So, the most acidic is the fluoroethanoic acid, then iodoethanoic acid, then ethanoic acid, and the last one is propanoic acid.

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