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Which of the following represents the correct order of the acidity in the given compounds?

1. FCH2COOH > CH3COOH > BrCH2COOH > ClCH2COOH
2. BrCH2COOH > ClCH2COOH > FCH2COOH > CH3COOH
3. FCH2COOH > ClCH2COOH > BrCH2COOH > CH3COOH
4. CH3COOH > BrCH2COOH > ClCH2COOH > FCH2COOH

Correct answer: FCH2COOH > ClCH2COOH > BrCH2COOH > CH3COOH

Solution

The acidity of substituted carboxylic acids depends on the electron-withdrawing ability of the substituents. Fluorine (F) is the most electronegative, followed by chlorine (Cl) and bromine (Br), which increases the acidity in the order F > Cl > Br > H.

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