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Account for the following acidic strength order:
$FCH subscript 2 COOH space space space space space greater than space space space space ClCH subscript 2 COOH space space space greater than space space BrCH subscript 2 COOH space space greater than space space ICH subscript 2 COOH space greater than space CH subscript 3 COOH$

Size of atom down the group decreases thus, the electron-withdrawing power of the halogen decreases, the stability of the conjugate base also decreases. Hence, the acidic strength decreases as we move from FCH₂COOH to CH₃COOH.

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