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प्रश्न
Show how will you synthesize pentan-1-ol using a suitable alkyl halide.
उत्तर
Hydrolysis of 1-bromopentane by aqueous NaOH gives pentan-1-ol.
\[\ce{\underset{1-bromopentane}{CH3 - CH2 - CH2 - CH2 - CH2 - Br} + NaOH ->[\Delta][S_{N}2 Hydrolysis ] \underset{pentan-1-ol}{CH3CH2CH2CH2 - CH2 - OH} + NaBr}\]
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संबंधित प्रश्न
Write the mechanism of the following reaction :
Give the equation of the following reaction:
Oxidation of propan-1-ol with alkaline KMnO4 solution.
Name the reagent used in the following reaction:
Benzyl alcohol to benzoic 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.)
Lucas reagent is ____________.
Lucas test is done to differentiate between ____________.
Identify the secondary alcohols from the following set:
- \[\ce{CH3CH2CH(OH)CH3}\]
- \[\ce{(C2H5)3COH}\]
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.
Explain why is OH group in phenols more strongly held as compared to OH group in alcohols.
Explain why nucleophilic substitution reactions are not very common in phenols.
In Kolbe’s reaction, instead of phenol, phenoxide ion is treated with carbon dioxide. Why?
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.
Assertion: Bond angle in ethers is slightly less than the tetrahedral angle.
Reason: There is a repulsion between the two bulky (–R) groups.
Which of the following observation is shown by 2-phenyl ethanol with Lucas Reagent?
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 dehydration of ethanol to yield ethene.
Write the mechanism of acid dehydration of ethanol to yield ethene.
