Arrange the following in decreasing orde...

Arrange the following in decreasing order of their acidic strength. Give explanation for the arrangement.
`C_(6)H_(5)COOH, FCH_(2)COOH, NO_(2)CH_(2)COOH`

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The decreasing order of acidic strength is :
`NO_(2)CH_(2)COOHgtFCH_(2)COOHgtC_(6)H_(5)COOH`.
This is explained on the basis of the electron withdrawing influence of the three groups which follows the order `-NO_(2)gt-Fgt-C_(6)H_(5).` For detailed explanation, consult section 17.

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