AP EAMCET202315 May 2023Evening ShiftChemistryIonic EquilibriumActual

Which of the following has more pK _ a value?

Options

A2-Nitrophenol
B3-Nitrophenol
C4-Nitrophenol
D2, 4-Dinitrophenol

Correct answer

B. 3-Nitrophenol

Step-by-step solution

Greater pK _ a value means smaller K _ a or weaker acid. Due to the presence of an electron-withdrawing - NO ₂ group at the meta position, 3- nitrophenol is the weakest acid among the given options. The effect of - NO ₂ is nullified at the meta position.

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