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Phenol is acidic, because:

1. it contains \( O H \) group
2. it has a cyclic structure
3. it conjugate base is stabilized by resonance
4. all the above

Correct answer: it conjugate base is stabilized by resonance

Solution

Phenol is acidic because deprotonation gives the phenoxide ion, whose negative charge is delocalized over the aromatic ring by resonance. The presence of an OH group alone or a cyclic structure does not by itself explain the acidity.

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