Some pairs of acids are given below. Select t | vedclass

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(A) The acidic strength of carboxylic acids is determined by the stability of the conjugate base (carboxylate ion).Electron-withdrawing groups ($-I$ e

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$CH_3CO_2H$ and $CH_2FCO_2H$

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(A) The acidic strength of carboxylic acids is determined by the stability of the conjugate base (carboxylate ion).Electron-withdrawing groups ($-I$ effect) stabilize the carboxylate ion and increase acidity.In option $(A)$,$CH_3CO_2H$ has no electron-withdrawing group,while $CH_2FCO_2H$ has a highly electronegative $F$ atom,which exerts a strong $-I$ effect.Therefore,$CH_2FCO_2H$ is significantly stronger than $CH_3CO_2H$.In other options,the second acid is weaker than the first because the $-I$ effect decreases as the distance of the substituent from the $-CO_2H$ group increases or as the electronegativity of the substituent decreases.

Some pairs of acids are given below. Select the pair in which the second acid is stronger than the first.

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