Compare the acidic strength of the following :
`(a) CH_(3) - CH_(2) - CH_(2) - COOH`
`(b) CH_(3) - underset(Cl) underset(|) CH - CH - COOH `
`(c) CH_(3) - underset(F) underset(|)CH - CH - COOH`
`(d) CH_(3) - underset(NO_(2))underset(|)(CH) - CH - COOH `

Explanation

To compare the acidic strength of the given compounds, we need to analyze the stability of their conjugate bases after the acidic hydrogen is removed. The compounds are:

(a) CH₃ - CH₂ - CH₂ - COOH (Butanoic acid)
(b) CH₃ - Cl - CH - CH - COOH (2-Chlorobutanoic acid)
(c) CH₃ - F - CH - CH - COOH (2-Fluorobutanoic acid)
(d) CH₃ - NO₂ - CH - CH - COOH (2-Nitrobutanoic acid)

### Step 1: Identify the conjugate bases
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