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AP EAMCET201823 Apr 2018Evening ShiftChemistryGeneral Organic ChemistryActual

Identify the correct set from the following Compound p K_a Compound p K_a

Options

  1. Am -nitrophenol 10.2
  2. Bo-nitrophenol 10.2
  3. Cm -nitrophenol 7.2
  4. Do-nitrophenol 7.2

Correct answer

D. o-nitrophenol 7.2

Step-by-step solution

In o -nitrophenol there is intramolecular H -bonding, since - NO ₂ group is very close to - OH group. Thus, proton can not be easily released from o -nitrophenol as compared to para and meta. Thus, p K_a is least.

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