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Question

The correct order of decreasing acid strength of the following carboxylic acids is:
1103436_81bf2a473e194c7cb25104735e082a2f.png

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Solution

The strength of carboxylic acid is higher if the negative charge on COO group is stabilized by some electron withdrawing group. Also, electron donating group decrease its acidity by destabilizing this negative charge. More stronger the electron donating group, less will be the acidity. Hence, for given compounds, order of acid strength will be:
III>II>I

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