Which of the following is the strongest acid?

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(A) The acidity of carboxylic acids is determined by the electron-withdrawing effect ($-I$ effect) of the substituents attached to the alpha-carbon.St

Vedclass · Accepted Answer

$CF_3COOH$

Vedclass · Answer

(A) The acidity of carboxylic acids is determined by the electron-withdrawing effect ($-I$ effect) of the substituents attached to the alpha-carbon.Stronger electron-withdrawing groups stabilize the carboxylate anion more effectively,thereby increasing acidity.The electronegativity of the halogens follows the order: $F > Cl > Br$.Therefore,the $-I$ effect is strongest for the trifluoromethyl group $(-CF_3)$ and weakest for the methyl group $(-CH_3)$.The order of acidic strength is: $CF_3COOH > CCl_3COOH > CBr_3COOH > CH_3COOH$.Thus,$CF_3COOH$ is the strongest acid.

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