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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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संबंधित प्रश्न
Write the final product(s) in each of the following reactions:
Write the mechanism of acid-catalysed dehydration of ethanol to yield ethene.
When 3-methylbutan-2-ol is treated with HBr, the following reaction takes place:
\[\begin{array}{cc}
\phantom{...................................}\ce{Br}\\
\phantom{..................................}|\\
\ce{CH3 - CH - CH - CH3 ->[HBr] CH3 - C - CH2 - CH3}\\
|\phantom{.........}|\phantom{...................................}|\phantom{...........}\\
\ce{CH3}\phantom{...}\ce{OH}\phantom{...............................}\ce{CH3}\phantom{.......}\\
\end{array}\]
Give a mechanism for this reaction.
(Hint: The secondary carbocation formed in step II rearranges to a more
stable tertiary carbocation by a hydride ion shift from 3rd carbon atom.)
Lucas test is used for the detection of _____________.
The compound which reacts fastest with Lucas reagent at room temperature is:
In the reduction \[\ce{R - CHO + H2 -> RCH2OH}\] the catalyst used 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
Dehydration of 2-butanol yields:
Which one of the following on oxidation gives a ketone?
Primary and secondary alcohols on the action of reduced copper give:
During dehydration of alcohols to alkenes by heating with cone. H2SO4 the initial step is ____________.
\[\ce{CH3CH2OH}\] can be converted into \[\ce{CH3CHO}\] by ______.
Name the factors responsible for the solubility of alcohols in water.
Which of the following observation is shown by 2-phenyl ethanol with Lucas Reagent?
Write the mechanism of acid dehydration of ethanol to yield ethene.
Write the mechanism of acid-catalysed dehydration of ethanol to yield ethene
