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AP EAMCET201823 Apr 2018Evening ShiftChemistryGeneral Organic ChemistryActual

Order of acidity of benzoic acid (I), 4-methoxybenzoic acid (II), acetic acid (III) and 4-nitrobenzoic acid (IV) is

Options

  1. AIV > I > II > III
  2. BI > II > IV > III
  3. CIII > I > II > IV
  4. DII > I > IV > III

Correct answer

A. IV > I > II > III

Step-by-step solution

An electron-donating group decreases the strength of acids, while electron withdrawing group increases the strength of acids. A methoxy group is clectron donating group, 4-methoxy benzoic acid is a weaker acid than benzoic acid. Nitro group is electron withdrawing group and will increase the strength of acids. Thus, correct order is 4-nitrobenzoic acid (IV) > benzoic acid (I) > 4-methoxy benzoic acid (II) > acetic acid (III)

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