Arrange the following compounds in increasing order of their acid strength: Benzoic acid, 4- Nitrobenzoic acid, 3,4-Dinitrobenzoic acid,
4- Methoxybenzoic acid."
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Increasing order of acid strength
Explanation:
The presence of electron releasing groups (ERG) reduces the acidic strength of the compound through the inductive effect. Contrarily, the electron withdrawing group (EWG) increases the acidic strength of a compound. The methoxy group is ERG, while the nitro group is EWG. So increasing number of EWG will increase the acidity.
Increasing order of acid strength will be Methoxy benzoic acid < Benzoic acid < 4-Nitrobenzoic acid <3,4-Dinitrobenzoic acid.
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