The resonance effect is defined as 'the polarity produced in the molecule by the interaction of two pi-bonds or between a pi-bond and lone pair of electrons present on an adjacentatom.' The effect is transmitted through the chain. In positive resonance effect, the transfer of electrons is away from an atom or substituent group attached to the conjugated system. This electron displacement makes certain positions in the molecule of high electron densities. In negative resonance effect, the transfer of electrons is towards the atom or substituent group attached to the conjugated system. Which of the following carboxylate ions is the most stable ?

The resonance effect is defined as 'the polarity produced in the molec

1.	The resonance effect is defined as 'the polarity produced in the molecule by the interaction of two pi-bonds or between a pi-bond and lone pair of electrons present on an adjacentatom.' The effect is transmitted through the chain. In positive resonance effect, the transfer of electrons is away from an atom or substituent group attached to the conjugated system. This electron displacement makes certain positions in the molecule of high electron densities. In negative resonance effect, the transfer of electrons is towards the atom or substituent group attached to the conjugated system. Which of the following carboxylate ions is the most stable ?
Answer» `CH_(3)-overset(O)overset(\|\|)(C)-O^(-)` `Cl-CH_(2)-overset(O)overset(\|\|)(C)-O^(-)` `I-CH_(2)-overset(O)overset(\|\|)(C)-O^(-)` SOLUTION :STABILITY of carboxylate ion is related to the dispersal of negative CHARGE on the ion. It is maximum in carboxylate ion (d) since it has two electron withdrawing F atoms (-I -effect) attached to `ALPHA`-carbon atom.