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कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान 2nd PUC Class 12

Explain why nucleophilic substitution reactions are not very common in phenols.

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प्रश्न

Explain why nucleophilic substitution reactions are not very common in phenols.

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उत्तर

The C – O bond in phenols has some double-bond character due to resonance and hence cannot be easily cleaved by nucleophiles. So, nucleophilic substitution reactions are not very common in phenols and they give many electrophilic substitution reactions.

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अध्याय 11: Alcohols, Phenols and Ethers - Multiple Choice Questions (Type - I) [पृष्ठ १६०]

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एनसीईआरटी एक्झांप्लर Chemistry Exemplar [English] Class 12
अध्याय 11 Alcohols, Phenols and Ethers
Multiple Choice Questions (Type - I) | Q 42 | पृष्ठ १६०

संबंधित प्रश्न

Ortho and para nitrophenols are more acidic than phenol. Draw the resonance structures of the corresponding phenoxide ions.


Name the reagent used in the following reaction:

Oxidation of a primary alcohol to aldehyde.


Lucas test is used for the detection of _____________.


The compound which reacts fastest with Lucas reagent at room temperature is:


By which of the following methods alcohol can be prepared in excellent yield?


Which of the following are used to convert RCHO into RCH2OH?

(i) H2/Pd

(ii) LiAlH4

(iii) NaBH4

(iv) Reaction with RMgX followed by hydrolysis


Which one of the following on oxidation gives a ketone?


Primary and secondary alcohols on the action of reduced copper give:


\[\ce{CH3CH2OH}\] can be converted into \[\ce{CH3CHO}\] by ______.


Identify the secondary alcohols from the following set:

  1. \[\ce{CH3CH2CH(OH)CH3}\]
  2. \[\ce{(C2H5)3COH}\]



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.


What happens when (CH3)3 C – OH is heated with Cu/573 K?

Write the chemical equation in support of your answer.


Write the mechanism of acid-catalysed 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


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