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प्रश्न
Ortho and para nitrophenols are more acidic than phenol. Draw the resonance structures of the corresponding phenoxide ions.
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उत्तर
Resonance structures of o-nitrophenoxide ion
Resonance structures of p-nitrophenoxide ion
Resonance structures of phenoxide ion
In substituted phenols, electron-withdrawing groups such as the nitro group increase the acidic strength of phenol. This effect becomes more potent when such groups are present at the ortho and para positions. This is because of the effective delocalisation of the anion of the phenoxide ion. Hence, o- and p-nitrophenols are more acidic than phenol.
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संबंधित प्रश्न
Give reasons for the following:
o-nitrophenol is more acidic than o-methoxyphenol.
Name the reagent used in the following reaction:
Oxidation of a primary alcohol to carboxylic acid.
Name the reagent used in the following reaction:
Oxidation of a primary alcohol to aldehyde.
Write the mechanism (using curved arrow notation) of the following reaction :
Lucas reagent is ____________.
Lucas test is used for the detection of _____________.
The compound which reacts fastest with Lucas reagent at room temperature is:
Primary and secondary alcohols on the action of reduced copper give:
The process of converting alkyl halides into alcohols involves ______.
Alcohols react with active metals e.g. Na, K etc. to give corresponding alkoxides. Write down the decreasing order of reactivity of sodium metal towards primary, secondary and tertiary alcohols.
Explain why is OH group in phenols more strongly held as compared to OH group in alcohols.
In Kolbe’s reaction, instead of phenol, phenoxide ion is treated with carbon dioxide. Why?
Assertion: Bond angle in ethers is slightly less than the tetrahedral angle.
Reason: There is a repulsion between the two bulky (–R) groups.
Which of the following alcohols will not undergo oxidation?
Write the mechanism of acid dehydration of ethanol to yield ethene.
Write the mechanism of acid-catalysed dehydration of ethanol to yield ethene.
Write the mechanism of acid dehydration of ethanol to yield ethene.
