Out of the given 3, phenol is the strongest acid because the phenoxide ion obtained after removal of H is resonance stabilized.
Whereas ethanol is least acidic because the ethoxide ion formed after removal of H is destabilized by +I effect of C2H5 group. No such +I effect is observed in case of water thus, it is a stronger acid than ethanol.
Hence, the increasing order of their acidic character is as follows ethanol< water< phenol.
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