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प्रश्न
In Kolbe’s reaction, instead of phenol, phenoxide ion is treated with carbon dioxide. Why?
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उत्तर
Phenoxide ion is more reactive than phenol towards electrophilic substitution. The negative charge on oxygen is transferred to benzene through resonance. This helps in the attachment of CO2 which is a weak electrophile to the benzene ring finally giving salicylic acid.
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संबंधित प्रश्न
Write the final product(s) in each of the following reactions:
Give reasons for the following:
o-nitrophenol is more acidic than o-methoxyphenol.
Write the mechanism of the following reaction:
Write the mechanism of the following reaction :
Name the reagent used in the following reaction:
Oxidation of a primary alcohol to carboxylic acid.
Name the reagent used in the following reaction:
Benzyl alcohol to benzoic acid.
Write the mechanism (using curved arrow notation) of the following reaction :
The compound which reacts fastest with Lucas reagent at room temperature is:
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(i) H2/Pd
(ii) LiAlH4
(iii) NaBH4
(iv) Reaction with RMgX followed by hydrolysis
Identify the secondary alcohols from the following set:
- \[\ce{CH3CH2CH(OH)CH3}\]
- \[\ce{(C2H5)3COH}\]
Explain why is OH group in phenols more strongly held as compared to OH group in alcohols.
Why is the C – O – H bond angle in alcohols slightly less than the tetrahedral angle whereas the C – O – C bond angle in ether is slightly greater?
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 dehydration of ethanol to yield ethene.
Write the mechanism of acid dehydration of ethanol to yield ethene.
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-catalysed dehydration of ethanol to yield ethene
