Phenol is less acidic than

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(C) The acidity of phenols is increased by the presence of electron-withdrawing groups $(EWG)$ such as the nitro group $(-NO_2)$ attached to the benze

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$o$-nitrophenol

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(C) The acidity of phenols is increased by the presence of electron-withdrawing groups $(EWG)$ such as the nitro group $(-NO_2)$ attached to the benzene ring,as they stabilize the phenoxide ion through inductive and resonance effects.Conversely,electron-donating groups $(EDG)$ like the methyl group $(-CH_3)$ decrease the acidity of phenol.Aliphatic alcohols like ethanol and methanol are significantly less acidic than phenol.Therefore,$o$-nitrophenol is more acidic than phenol.

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