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

Suggest a reagent for the following conversion.

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प्रश्न

Suggest a reagent for the following conversion.

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उत्तर

Pyridinium chlorochromate (PCC), a complex of chromium trioxide with pyridine and HCl.

\[\ce{CH3 - CH = CH - CH2OH ->[PCC] CH3 - CH = CH - CHO}\]

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अध्याय 11: Alcohols, Phenols and Ethers - Multiple Choice Questions (Type - I) [पृष्ठ १५९]

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एनसीईआरटी एक्झांप्लर Chemistry Exemplar [English] Class 12
अध्याय 11 Alcohols, Phenols and Ethers
Multiple Choice Questions (Type - I) | Q 27 | पृष्ठ १५९

संबंधित प्रश्न

Write the final product(s) in each of the following reactions:


Give the equation of the following reaction:

Oxidation of propan-1-ol with alkaline KMnO4 solution.


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:

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

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.)


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 of the following is not true in case of reaction with heated copper at 300°C?


Lucas test is done to differentiate between ____________.


Identify the secondary alcohols from the following set:

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



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


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


Ethers can be prepared by Williamson synthesis in which an alkyl halide is reacted with sodium alkoxide. Di-tert-butyl ether can’t be prepared by this method. Explain.


The correct geometry around oxygen in CH3OCH3 is 


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.


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