Question

Ionic species are stabilised by the dispersal of charge. Which
of the following carboxylate ion is the most stable?
O O
|| ||
(a) CH₃ - C-O⁻ (b) Cl - CH₂ - C-O⁻
O
||
(c) F- CH₂ - C-O⁻

F
(d) CH - C - O⁻
F

Answer 1

Answer:

last option is correct.......

....

.......

Answer 2

$(F_2CHCOO^-)$ is most stable ion.

Explanation:

• The stability of an anionic radicle depends in the dispersal of charge density over the molecule.

• Here among the options, we can see it's a carboxylate ion.

• The alpha hydrogen is replaced by one chlorine, one fluorine and two fluorine in the last 3 options.

• The halides have the negative inductive effect which actually makes the carboxyl carbon more positive.

• This helps to resonate the charge between two oxygen atoms.

• This helps in charge dispersal and thereby helps in stability of atom.

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