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`

Explanation

To arrange the compounds \( C_6H_5COOH \) (benzoic acid), \( FCH_2COOH \) (fluoroacetic acid), and \( NO_2CH_2COOH \) (nitroacetic acid) in decreasing order of their acidic strength, we need to analyze the stability of their corresponding anions after they donate a proton (H⁺).

### Step 1: Identify the Anions
When these acids donate a proton, they form the following anions:
1. \( C_6H_5COO^- \) (benzoate ion)
2. \( FCH_2COO^- \) (fluoroacetate ion)
3. \( NO_2CH_2COO^- \) (nitroacetate ion)

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