Phenol is acidic because of the resonance stabilization of its conjugate base, namely:

phenoxide ion

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epoxide ion

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benzoate ion

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none of these

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Solution

The correct option is A phenoxide ion
The conjugate base of $p h e n o l (C_{6} H_{5} O H)$ is $p h e n o x i d e (C_{6} H_{5} O^{-})$ also called $p h e n o l a t e$ ion.

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Ortho and para nitrophenols are more acidic than phenol. Draw the resonance structures of the corresponding phenoxide ions.

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