
Arrange : Water, ethanol and phenol in increasing order of acidity and give reasons for your answer.
Answer
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Hint :When a hydrogen atom in an aliphatic or aromatic hydrocarbon is replaced by a –OH group, alcohols and phenols are formed. Compound groups have a wide range of uses in business and everyday life.
Complete Step By Step Answer:
Since phenol has a propensity to lose H+ ion and form phenoxide ions, it is more acidic than water. As water loses ion, it forms hydroxide, which is not stabilised by resonance. Water with a pH greater than ethanol is more acidic than ethanol.
The phenoxide ion obtained after the removal of a proton is stabilised by resonance whereas the ethoxide ion obtained after the removal of a proton is destabilised by the effect of — group. Therefore phenol is a stronger acid than ethanol. However, ethanol is a weaker acid than water since the electron releasing — group in ethanol increases the electron density on oxygen, resulting in a decrease in the polarity of the bond in ethanol, resulting in a decrease in acidic strength. As a result, acidic intensity rises in the order mentioned above.
Also we can say that, this is due to the fact that the phenoxide ion formed after the removal of is resonance stabilised, while the ethoxide ion formed after the removal of is destabilised due to the +1 effect of the ethyl community. As a result, phenol is a more powerful acid than ethanol.
Increasing order of acidity is: ethanol < water < phenol.
Note :
The conjugate base is weaker while the acid is heavier. As a consequence, any factor that raises acidity by stabilising the conjugate base. The donation of a proton from an acid to a base is known as an acid-base reaction. The acid is the species that loses .
Complete Step By Step Answer:
Since phenol has a propensity to lose H+ ion and form phenoxide ions, it is more acidic than water. As water loses
The phenoxide ion obtained after the removal of a proton is stabilised by resonance whereas the ethoxide ion obtained after the removal of a proton is destabilised by the effect of —
Also we can say that, this is due to the fact that the phenoxide ion formed after the removal of is
Increasing order of acidity is: ethanol < water < phenol.
Note :
The conjugate base is weaker while the acid is heavier. As a consequence, any factor that raises acidity by stabilising the conjugate base. The donation of a proton
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