Which of the following compounds has the high | vedclass

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(C) The $pK_a$ value is inversely proportional to the acidity of the compound. $A$ stronger acid has a lower $pK_a$ value,while a weaker acid has a hi

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$p$-Methylbenzoic acid

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(C) The $pK_a$ value is inversely proportional to the acidity of the compound. $A$ stronger acid has a lower $pK_a$ value,while a weaker acid has a higher $pK_a$ value.Acidity depends on the stability of the conjugate base (carboxylate ion). Electron-withdrawing groups $(EWG)$ increase acidity,while electron-donating groups $(EDG)$ decrease acidity.Comparing the substituents on the benzene ring:$1$. $-NO_2$ is a strong $EWG$ (increases acidity).$2$. $-Cl$ is a weak $EWG$ (increases acidity).$3$. $-H$ is the reference.$4$. $-CH_3$ is an $EDG$ (decreases acidity).Since $-CH_3$ is an electron-donating group,it destabilizes the carboxylate ion,making $p$-methylbenzoic acid the weakest acid among the given options.Therefore,$p$-methylbenzoic acid has the highest $pK_a$ value.

Which of the following compounds has the highest $pK_a$ value?

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