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

Options

A. `CH_(3)-oversetoverset(O)(||)(C)-O^(-)`
B. `Cl-CH_(2)-oversetoverset(O)(||)(C)-O^(-)`
C. `F-CH_(2)-oversetoverset(O)(||)(C)-O^(-)`
D.

Answer

D

Explanation

Factors which decrease the -ve charge, increase the stability of anion. The presence of two F atoms in optin (D) disperses the -ve charge of oxygen atom. This is because F atom has stron -I effect. Thus most stable anion is (D)