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

Suggest a reagent for the following conversion. - Chemistry

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प्रश्न

Suggest a reagent for the following conversion.

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

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

संबंधित प्रश्‍न

Name the reagent used in the following reaction:

Oxidation of a primary alcohol to carboxylic acid.


Name the reagent used in the following reaction:

Oxidation of a primary alcohol to aldehyde.


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.)


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


Lucas test is done to differentiate between ____________.


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 ____________.


Mark the correct increasing order of reactivity of the following compounds with HBr/HCl.

(a)
(b)
(c)

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 nucleophilic substitution reactions are not very common in phenols.


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?


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.


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


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


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