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

Explain why is OH group in phenols more strongly held as compared to OH group in alcohols. - Chemistry

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प्रश्न

Explain why is OH group in phenols more strongly held as compared to OH group in alcohols.

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उत्तर

In phenol, oxygen atom is attached to sp2-hybridised carbon atom while in alcohol, it is attached to sp3-hybridised carbon atom. The bond formed between oxygen and sp2-hybridised carbon is more strongly held then that formed between oxygen and sp3-hybridised carbon.

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

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एनसीईआरटी एक्झांप्लर Chemistry [English] Class 12
अध्याय 11 Alcohols, Phenols and Ethers
Multiple Choice Questions (Type - I) | Q 41 | पृष्ठ १६०

संबंधित प्रश्न

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 :


Give the equation of the following reaction: 

Dilute HNO3 with phenol.


Give the equation of the following reaction: 

Treating phenol with chloroform in the presence of aqueous NaOH.


Name the reagent used in the following reaction:

Oxidation of a primary alcohol to carboxylic acid.


When 3-methylbutan-2-ol is treated with HBr, the following reaction takes place:

\[\begin{array}{cc}
\phantom{.......................}\ce{Br}\\
\phantom{......................}|\\
\ce{CH3 - CH - CH - CH3 ->[HBr] CH3 - C - CH2 - CH3}\\
\phantom{.}|\phantom{......}|\phantom{......................}|\phantom{........}\\
\phantom{}\ce{CH3}\phantom{...}\ce{OH}\phantom{...................}\ce{CH3}\phantom{.....}
\end{array}\]

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.)


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


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


Lucas test is done to differentiate between ____________.


Which one of the following on oxidation gives a ketone?


The compound which gives the most stable carbonium ion on dehydration is:


During dehydration of alcohols to alkenes by heating with cone. H2SO4 the initial step is ____________.


Name the factors responsible for the solubility of alcohols in water.


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.


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?


Write the mechanism of acid dehydration of ethanol to yield ethene.


Write the mechanism of acid-catalysed dehydration of ethanol to yield ethene.


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