For which compound is pK_a the highest? | vedclass

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(B) The $pK_a$ value is inversely proportional to the acidity of a compound. $A$ higher $pK_a$ value indicates lower acidity.Acidity is determined by

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$CH_3CH_2COOH$

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(B) The $pK_a$ value is inversely proportional to the acidity of a compound. $A$ higher $pK_a$ value indicates lower acidity.Acidity is determined by the stability of the conjugate base,which is influenced by the inductive effects of the substituents attached to the $-COOH$ group.Electron-withdrawing groups ($-I$ effect) increase acidity,while electron-donating groups ($+I$ effect) decrease acidity.Comparing the given compounds:$1$. $HCOOH$ (Formic acid): No alkyl group attached.$2$. $CH_3CH_2COOH$ (Propanoic acid): Contains an ethyl group,which is electron-donating ($+I$ effect).$3$. $C_6H_5CH_2COOH$ (Phenylacetic acid): Contains a phenyl group,which is electron-withdrawing ($-I$ effect).$4$. $ClCH_2CH_2COOH$ ($3$-Chloropropanoic acid): Contains a chlorine atom,which is strongly electron-withdrawing ($-I$ effect).Since the ethyl group in $CH_3CH_2COOH$ is electron-donating,it destabilizes the carboxylate anion,making it the least acidic among the options. Therefore,$CH_3CH_2COOH$ has the highest $pK_a$ value.

For which compound is $pK_a$ the highest?

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