The pK_a values in H_2O of picric acid,acetic | vedclass

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Question

(A) The acidity of a compound is inversely proportional to its $pK_a$ value.Picric acid ($2,4,6$-trinitrophenol) is a very strong acid due to the stro

Vedclass · Accepted Answer

Picric acid $0.4$,acetic acid $4.75$,phenol $10.0$

Vedclass · Answer

(A) The acidity of a compound is inversely proportional to its $pK_a$ value.Picric acid ($2,4,6$-trinitrophenol) is a very strong acid due to the strong electron-withdrawing effect of three $-NO_2$ groups,which stabilizes the phenoxide ion,resulting in a low $pK_a$ of approximately $0.4$.Acetic acid is a moderately strong organic acid with a $pK_a$ of approximately $4.75$.Phenol is a weak acid with a $pK_a$ of approximately $10.0$.Therefore,the correct order of $pK_a$ values is: Picric acid $(0.4)$ < Acetic acid $(4.75)$ < Phenol $(10.0)$.

The $pK_a$ values in $H_2O$ of picric acid,acetic acid,and phenol are in the order:

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