Give the correct order of increasing acidity of the following compounds

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D < B < A < C

B < A < D < C

A < B < D < C

D < A < B < C

answer is A.

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Detailed Solution

Let have a look on carboxylate ionAs we can see that resonance structure of carboxylate anion is more stable due to resonanceNow have a look on phenoxide ionHere we observe that it have 5 resonating structures conclusion in structures of carboxylate ion, the negative charge is on oxygen, but incase of phenoxide ion, the negative charge is present on carbon(in 3 out of 4 structures ). Thus carbohydrates ion is more stable than phenoxide ion. Because C-O bond is much stronger than that C-C bond. Thus carboxylic acid stronger acid than phenol

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