Arrange the given compounds in the increasing order of their acidic strength.

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Solution

Carboxylic acid derivatives are stronger acids than phenol.

Electron donating group decreases acidity while electron withdrawing group increases acidity.

$- C H_{3}$ show $+ I$ effect but $- C l$ shows $- I$ effect.

so, the acidic strength order will be $I I I > I > I I > I V$ .

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