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KCET2013ChemistryAlcohols Phenols and Ethers

Which of the following is strongly acidic?

Options

  1. APhenol
  2. Bo-cresol
  3. Cp-nitrophenol
  4. Dp -cresol

Correct answer

C. p-nitrophenol

Step-by-step solution

The acidity of phenols is due to the greater resonance stabilization of the phenoxide ion relative to phenol. Therefore, electron withdrawing groups (EWG) like - NO ₂ which stabilize the phenoxide ion more by dispersing the negative charge will tend to increase the acidity of phenols. On the other hand, electron donating groups (EDG) like-alkyl group destabilize the phenoxide ion by intensifying the negative charge relative to phenol tend to decrease the acidic strength of phenols. As methyl group has +1 effect and

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