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प्रश्न
Compare acidity of phenol with that of ethanol.
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उत्तर १
Phenol is more acidic than ethanol. This is because the phenoxide ion obtained after the release of a proton from phenol becomes stable through resonance, whereas the ethoxide ion (after the release of a proton from ethanol) is not stable.
उत्तर २
Compared with ethanol, phenols are more acidic. They lose their H atom as H+ more readily than alcohols. The behaviour of phenol can be attributed to resonance stabilisation arising from the contributing structures of the corresponding phenoxide ion.
The resonance stabilisation from the contributing structures (I)-(V) sufficiently offsets the O–H bond dissociation energy, rendering phenol acidic.
No resonance structures exist for the ethoxide ion; hence, the conversion of ethanol to ethoxide is not encouraged under standard conditions. Therefore, ethanol exhibits lower acidity compared to phenol.
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संबंधित प्रश्न
Give the structure of the product you would expect when the following alcohol reacts with HCl–ZnCl2.
Butan-1-ol
Give two reactions that show the acidic nature of phenol.
Explain how does the −OH group attached to a carbon of benzene ring activate it towards electrophilic substitution?
Account for the following:
o-nitrophenol is more steam volatile than p-nitrophenol.
The product obtained from the reaction is:
Acidity of phenol is due to ____________.
The ionization constant of phenol is higher than that of ethanol because ____________.
In CH3CH2OH, the bond that undergoes heterolytical change most readily is ____________.
Strength of acidity is in order:
Arrange the following in decreasing order of acidic character:
What is the correct order of reactivity of alcohols in the following reaction?
\[\ce{R-OH + HCl ->[ZnCl2] R-Cl + H2O}\]
Out of o-nitrophenol and o-cresol which is more acidic?
Assertion: o-Nitrophenol is less soluble in water than the m- and p-isomers.
Reason: m- and p- Nitrophenols exist as associated molecules.
Phenol is used in the manufacture of
Which one of the following has the lowest pKa value?
Give the structure of the product you would expect when the following alcohol reacts with HCl–ZnCl2.
2-Methylbutan-2-ol
Give the structure of the product you would expect when the following alcohol reacts with SOCl2.
Butan-1-ol
Give the structure of the product you would expect when the following alcohol reacts with SOCl2.
2-Methylbutan-2-ol
