Interpretation:
The more acidic phenol in each pair is to be identified.
Concept Introduction:
The acidity of phenols depends on the ease with which the acidic hydrogen is removed and the relative stability of the conjugate base that results after hydrogen is lost. The acidic nature in substituted phenols is governed by the electronic nature of the substituent.
In the ring, the electron withdrawing groups (EWG) decreases the electron density and thus; stabilizes the phenoxide ion. The EWG such as
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