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AP EAMCET202023 Sep 2020Morning ShiftChemistryChemical Bonding and Molecular StructureActual

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

Options

  1. AI < II < III < IV
  2. BI < IV < II < III
  3. CIV < I < II < III
  4. DIV < I < III < II

Correct answer

C. IV < I < II < III

Step-by-step solution

Since electron-donating groups decrease the acid strength, 4 - methoxy benzoic acid is a weaker acid than benzoic acid. Further, since electron-withdrawing groups increase the acid strength, both 4 - nitrobenzoic acid and 3 ,   4 - dinitrobenzoic acid are stronger acids than benzoic acid. Further, due to the presence of an additional NO 2 ​ at m - position with respect to COOH group, 3 ,   4 - dinitrobenzoic acid, the overall acid strength increase in the order: 4 - methoxy benzoic acid < Benzoic acid

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