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Arrange the following in the increasing ...

Arrange the following in the increasing order of their acidic strength :
Benzoic acid , 4-Methoxybenzoic acid, 4-Nitrobenzoic acid and 4-Methylbenzoic acid.

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Electron donating group `(-OCH_(3))` decreases the acidic strength where as electron withdrawing group `(NO_(2))` increases the same.
Increases order of acidic strength is :
4-Methoxy benzoic acid `lt ` benzoic acid `lt` 4-nitrobenzoic acid `lt 3, `4-dinitro benzoic acid.
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