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प्रश्न
Which of the following observation is shown by 2-phenyl ethanol with Lucas Reagent?
विकल्प
Turbidity will be observed within five minutes.
No turbidity will be observed.
Turbidity will be observed immediately.
Turbidity will be observed at room temperature but will disappear after five minutes.
उत्तर
No turbidity will be observed.
Explanation:
Alcohols are soluble in Lucas reagent (conc. HCl and ZnCl2) while their halides are immiscible and produce turbidity in solution. In case of tertiary alcohols, turbidity is produced immediately as they form the halides easily. Primary alcohols do not produce turbidity at room temperature.
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संबंधित प्रश्न
Write the final product(s) in each of the following reactions:
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.)
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The compound which gives the most stable carbonium ion on dehydration is:
Assertion: Bond angle in ethers is slightly less than the tetrahedral angle.
Reason: There is a repulsion between the two bulky (–R) groups.
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Write the chemical equation in support of your answer.
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Write the mechanism of acid dehydration of ethanol to yield ethene.
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