Ionic species are stabilised by the dispersal of charge. Which of the following carboxytate ion is the most stable?

Ionic species are stabilised by the dispersal of charge. Which of the

1.	Ionic species are stabilised by the dispersal of charge. Which of the following carboxytate ion is the most stable?
Answer» `CH_(3)-overset(overset(O)(\|\|))(C )-O^(-)` `Cl- CH_(2)- overset(overset(O)(\|\|))(C )-O^(-)` `F-CH_(2)- overset(overset(O)(\|\|))(C )-O^(-)` Solution :D is maximum stable (i) Here, the -ve charge is dispersed by +R effect of the carboxylate iona ND -I effect of the halogen. Since + R effect is COMMON in all the four structure, therefore, overall dispersal of -ve charge depends upon the on. Of halogen atoms and their ELECTRONEGATIVITY. Since, F has the HIGHEST electronegativity and option (d) has two such Fatoms, therefore, dispersal of -ve charge is maximum in option (d). The resonance structures are of under Because of F in resonance, the maximumstabilisation occurs in (d). (ii) Inductive effect: Due to -I effect Cl and F attract the electrons of bond towards them In (d) due to (-I) effect of two F, the maximum change is established