Please answer the question

Dear Student,
Lesser the pKa value, greater the acidic character.
Here acidic character is in the order: (D) > (C) > (A) > (B)
So least pKa value is of option (D) i.e., p-Nitrophenol.
p-Nitrophenol is more acidic than o-Nitrophenol because in o-nitrophenol intramolecular hydrogen bonding is present due to which it is difficult to lose H+ ion.
p-Methylphenol is least acidic because CH3 is a electron donating group which decrease the polarity of O-H bond making it very difficult to lose H+ ion.

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