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Consider the acidity of the carboxylic acids:
Which of the following order is correct?

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ii > iv > i > iii

ii > iv > iii > i

ii > iii > iv > i

i > ii > iii > iv

answer is D.

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Detailed Solution

Electron withdrawal group is acid strengthening group. Due to ortho effect, $o - {NO}_{2} C_{6} H_{4} COOH$ is the strongest acid.

$p - {NO}_{2} C_{6} H_{4} COOH$ is more acidic than $m - {NO}_{2} C_{6} H_{4} COOH$ , because the former generates positive charge on carbon bearing — $COOH$ group whereas the latter generates positive charge on the next carbon atoms.

Thus, the correct order is Question Image

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