The increasing order of pKa for the following phenols is (A) 2,4-Dinitrophenol (B) 4-Nitrophenol (C) 2, 4, 5-Trimethylphenol (D) Phenol (E) 3-Chlorophenol (A) (A), (E), (B), (D), (C) (B) (C), (E), (D)

Question

The increasing order of pKa for the following phenols is (A) 2,4-Dinitrophenol (B) 4-Nitrophenol (C) 2, 4, 5-Trimethylphenol (D) Phenol (E) 3-Chlorophenol

(A) (A), (E), (B), (D), (C)
(B) (C), (E), (D), (B), (A)
(C) (C), (D), (E), (B), (A)
(D) (A), (B), (E), (D), (C)

Prashant Kotian · Accepted Answer

Correct answer: D. (A) OH NO2 NO2 (B) OH NO2 (C) OH (D) OH (E) OH Cl Increasing order of pKa means most acidic will be placed first. –M groups at ortho and para position increases acidic strength in phenol hence (A) is most acidic. +M, Hyperconjugation, +I decreases Ka value of hence (C) is least Acidic.

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