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Question: Answered & Verified by Expert
Arrange the following phenols in decreasing order of their $\mathrm{pK}_{\mathrm{a}}$

ChemistryGeneral Organic ChemistryTS EAMCETTS EAMCET 2022 (19 Jul Shift 2)
Options:
  • A D > B > C > A
  • B A > C > B > D
  • C A > C > D > B
  • D B > D > C > A
Solution:
2293 Upvotes Verified Answer
The correct answer is: A > C > B > D
Acidity $\propto \frac{1}{\mathrm{P}_{\mathrm{ka}}} \propto-$ Ieffect
The correct order of $\mathrm{P}_{\mathrm{ka}}$ is Phenol $>$ meta-nitrophenol $>$ ortho-nitrophenol > para-nitrophenol.

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