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(C) The acidic strength of substituted benzoic acids depends on the electronic effects of the substituents attached to the benzene ring.$1.$ Electron-

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$IV < I < II < III$

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(C) The acidic strength of substituted benzoic acids depends on the electronic effects of the substituents attached to the benzene ring.$1.$ Electron-donating groups $(EDG)$ like $-OCH_3$ (methoxy group) decrease the acidity by destabilizing the carboxylate anion. Thus,$4-$methoxybenzoic acid $(IV)$ is the weakest acid.$2.$ Electron-withdrawing groups $(EWG)$ like $-NO_2$ (nitro group) increase the acidity by stabilizing the carboxylate anion through $-I$ and $-M$ effects.$3.$ Benzoic acid $(I)$ has no substituent. $4-$nitrobenzoic acid $(II)$ has one $-NO_2$ group,and $3, 4-$dinitrobenzoic acid $(III)$ has two $-NO_2$ groups.$4.$ Since $III$ has two electron-withdrawing groups,it is more acidic than $II$.Therefore,the increasing order of acidic strength is: $IV < I < II < III$.

The increasing order of acidic strength among the following compounds is
$I.$ Benzoic acid
$II.$ $4-$nitrobenzoic acid
$III.$ $3, 4-$dinitrobenzoic acid
$IV.$ $4-$methoxybenzoic acid

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The increasing order of acidic strength among the following compounds is$I.$ Benzoic acid$II.$ $4-$nitrobenzoic acid$III.$ $3, 4-$dinitrobenzoic acid$IV.$ $4-$methoxybenzoic acid