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