Which of the following acids has the highest | vedclass

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(A) The $pK_{a}$ value is inversely proportional to the acid strength. Stronger acids have lower $pK_{a}$ values,while weaker acids have higher $pK_{a

Vedclass · Accepted Answer

$C_{6}H_{5}CH_{2}COOH$

Vedclass · Answer

(A) The $pK_{a}$ value is inversely proportional to the acid strength. Stronger acids have lower $pK_{a}$ values,while weaker acids have higher $pK_{a}$ values.Electron-withdrawing groups (EWGs) increase the acidity of carboxylic acids by stabilizing the carboxylate anion through the inductive effect.Comparing the substituents attached to the $CH_{2}COOH$ group:$1$. $C_{6}H_{5}-$ (Phenyl group): Weakly electron-withdrawing or electron-donating by resonance,making it the least acidic among the options.$2$. $O_{2}N-$ (Nitro group): Strong electron-withdrawing group ($-I$ and $-M$ effect).$3$. $F-$ (Fluoro group): Strong electron-withdrawing group ($-I$ effect).$4$. $NC-$ (Cyano group): Strong electron-withdrawing group ($-I$ effect).Since $C_{6}H_{5}CH_{2}COOH$ has the weakest electron-withdrawing group,it is the least acidic and therefore has the highest $pK_{a}$ value.

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

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