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(D) The stability of a carboxylate ion $(R-COO^-)$ is increased by the presence of electron-withdrawing groups (EWGs) attached to the alpha carbon. Th

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$F_2CH-COO^-$

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(D) The stability of a carboxylate ion $(R-COO^-)$ is increased by the presence of electron-withdrawing groups (EWGs) attached to the alpha carbon. These groups stabilize the negative charge through the inductive effect ($-I$ effect) by dispersing the charge density. Comparing the given options: $A$: $CH_3-COO^-$ (contains an electron-donating methyl group,which destabilizes the ion). $B$: $Cl-CH_2-COO^-$ (contains one $Cl$ atom,which has a $-I$ effect). $C$: $F-CH_2-COO^-$ (contains one $F$ atom,which has a stronger $-I$ effect than $Cl$). $D$: $F_2CH-COO^-$ (contains two $F$ atoms,which exert a much stronger combined $-I$ effect than a single $F$ or $Cl$ atom). Since the $-I$ effect is additive and distance-dependent,the presence of two fluorine atoms provides the greatest dispersal of the negative charge,making $F_2CH-COO^-$ the most stable carboxylate ion.

Ionic species are stabilized by the dispersal of charge. Which of the following carboxylate ions is the most stable?

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