The increasing order of pK _ a for the following phenols is (A) 2,4-Dinitrophenol (B) 4-Nitrophenol (C) 2,4,5-Trimethylphenol (D) Phenol (E) 3-Chlorophenol Choose the correct answer from the option given below :

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Correct answer: B. (A), (B), (E), (D), (C)

Order of acidity for following phenol is

The increasing order of pK _ a for the following phenols is (A) 2,4-Dinitrophenol (B) 4-Nitrophenol (C)

Increasing order of pK_a 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 K_aValue of 2,4,5-Trimethylphenol. Hence (C), is least acidity.

So, the order of pK_a value is (A) < (B )< (E)< (D)< (C).

The increasing order of pK _ a for the following phenols is (A)...

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