Example 7.4
Chapter 7: ALCOHOLS,PHENOLS AND ETHERS · CHEMISTRY · EN medium
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. Esterification Alcohols and phenols react with carboxylic acids, acid chlorides and acid anhydrides to form esters. In substituted phenols, the presence of electron withdrawing groups such as nitro group, enhances the acidic strength of phenol. This effect is more pronounced when such a group is present at ortho and para positions. It is due to the effective delocalisation of negative charge in phenoxide ion when substituent is at ortho or para position. On the other hand, electron releasing groups, such as alkyl groups, in general, do not favour the formation of phenoxide ion resulting in decrease in acid strength. Cresols, for example, are less acidic than phenol.
📖 ncert books class 12 chemistry chapter 7 · Page 15
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. Esterification Alcohols and phenols react with carboxylic acids, acid chlorides and acid anhydrides to form esters. In substituted phenols, the presence of electron withdrawing groups such as nitro group, enhances the acidic strength of phenol. This effect is more pronounced when such a group is present at ortho and para positions.
It is due to the effective delocalisation of negative charge in phenoxide ion when substituent is at ortho or para position. On the other hand, electron releasing groups, such as alkyl groups, in general, do not favour the formation of phenoxide ion resulting in decrease in acid strength. Cresols, for example, are less acidic than phenol. The greater the p K a value, the weaker the acid.
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