The strongest acid is

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(B) The acidity of carboxylic acids is influenced by the presence of electron-withdrawing groups (EWGs) such as the chloro group $(-Cl)$.These groups

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trichloroacetic acid

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(B) The acidity of carboxylic acids is influenced by the presence of electron-withdrawing groups (EWGs) such as the chloro group $(-Cl)$.These groups exert a $-I$ (negative inductive) effect,which stabilizes the carboxylate anion by dispersing the negative charge.As the number of electron-withdrawing chlorine atoms increases,the $-I$ effect becomes stronger,leading to greater stabilization of the conjugate base and thus higher acidity.The order of acidity is: $CCl_3COOH > CHCl_2COOH > CH_2ClCOOH > CH_3COOH$.Therefore,trichloroacetic acid is the strongest acid among the given options.

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