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enter image description here What will be the order of acidity in the following compounds ? From My point of view it should be 3>1>2>4. But the answer given is 3>2>1>4. Can anyone explain how ?

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closed as off-topic by Mithoron, user55119, airhuff, MaxW, Jon Custer May 10 at 14:15

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I think you are correct. The $\mathrm{p}K_\mathrm{a}$ of 4-methylphenylacetic acid is quoted as 4.37 here. The $\mathrm{p}K_\mathrm{a}$ of benzoic acid is quoted as 4.19 by the same source here.

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  • $\begingroup$ m-nitrobenzoic acid has a pKa of 3.47, so yes the original poster is correct. $\endgroup$ – Michael Lautman May 9 at 20:39

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