Which compound has the highest value of pK_{a | vedclass

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(A) The $pK_{a}$ value is inversely proportional to the acidity of the compound. Higher $pK_{a}$ means lower acidity.$1$. $p-$cresol contains an elect

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$p-$cresol

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(A) The $pK_{a}$ value is inversely proportional to the acidity of the compound. Higher $pK_{a}$ means lower acidity.$1$. $p-$cresol contains an electron-donating methyl group $(-CH_{3})$,which decreases the acidity of phenol.$2$. Phenol has no substituent.$3$. $o-$nitrophenol and $m-$nitrophenol contain electron-withdrawing nitro groups $(-NO_{2})$,which significantly increase the acidity of phenol.Comparing these,$p-$cresol is the least acidic,therefore it has the highest $pK_{a}$ value.

Which compound has the highest value of $pK_{a}$?

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