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Consider the following phenols: The decreasing order of acidity of the above phenols is:

1. III > IV > I > II
2. II > I > IV > III
3. I > IV > II > III
4. III > IV > I > II

Correct answer: III > IV > I > II

Solution

The acidity of phenols depends on the stability of the phenoxide ion formed after deprotonation. Electron-withdrawing groups increase acidity by stabilizing the phenoxide ion, while electron-donating groups decrease it. Based on this, the correct order is III > IV > I > II.

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