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What is the effect of the following groups on the acidity of phenol ? (i) -CH_(3) group (ii) -NO_(2) group. |
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Answer» Solution :(i) The PRESENCE of `-CH_(3)`group in the phenol decreases the acidity of phenol as it is an ELECTRON donatinggroup. Therefore, it will INTENSIFY the NEGATIVE charge and thus, release of a proton becomes more difficult.As a result, the acidity decreases. (ii) Since - `NO_(2)`group is an electron withdrawing group. It disperses, the negative charge of the phenonide ion and thus STABILIZES it. Therefore, `NO_(2)`group will increase the acidic strength of phenols. 
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