The correct order of acidity for the following compounds is

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$I > I I I > I V > I I$

$III > I V > I I > I$

$I > I I > I I I > I V$

$III > I > I I > I V$

answer is A.

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Detailed Solution

We know that the strength of an acid depends upon the stability of its carboxylate anion. Greater the stability of the carboxylate anion more acidic is the carboxylic acid. Now the carboxylate ion from 2,6-dihyroxybenzoic acid (I) is more stable due to chelation with two OH groups than anion of salicyclic acid (II) which is stabilized by chelation with only one OH group

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