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AP EAMCET · Chemistry · Chemical Bonding and Molecular Structure

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

  1. A I<II<III<IV
  2. B I<IV<II<III
  3. C IV<I<II<III
  4. D IV<I<III<II
Verified Solution

Answer & Solution

Correct Answer

(C) IV<I<II<III

Step-by-step Solution

Detailed explanation

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…