Which compound has the maximum value of pK_a | vedclass

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(D) The $pK_a$ value is inversely proportional to the acidity of the compound. Higher acidity corresponds to a lower $pK_a$ value.Nitro groups $(-NO_2

Vedclass · Accepted Answer

$C_6H_5OH$

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(D) The $pK_a$ value is inversely proportional to the acidity of the compound. Higher acidity corresponds to a lower $pK_a$ value.Nitro groups $(-NO_2)$ are strong electron-withdrawing groups $(EWG)$ that increase the acidity of phenol by stabilizing the phenoxide ion through $-I$ and $-M$ effects.In $p-O_2N-C_6H_4-OH$,$m-O_2N-C_6H_4-OH$,and $o-O_2N-C_6H_4-OH$,the $-NO_2$ group increases acidity compared to phenol $(C_6H_5OH)$.Since $C_6H_5OH$ lacks any electron-withdrawing substituent,it is the least acidic among the given compounds.Therefore,$C_6H_5OH$ has the maximum $pK_a$ value.

Which compound has the maximum value of $pK_a$ among the following?

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