A) butanol-2
B) butanol-1
C) iso-butanol
D) 2-methyl-2-propanol
Correct Answer: D
Solution :
Among the \[1{}^\circ ,\text{ }2{}^\circ \]and \[3{}^\circ \] alcohols,\[3{}^\circ \]alcohols react with Lucas reagent readily and give turbidity while \[2{}^\circ \] give turbidity after 5 min and \[1{}^\circ \] do not react at room temperature. (a) \[\underset{\begin{smallmatrix} \text{2 }\!\!{}^\circ\!\!\text{ }\,\text{alcohol} \\ \text{(butanol-2)} \end{smallmatrix}}{\mathop{C{{H}_{3}}C{{H}_{2}}-\underset{OH}{\mathop{\underset{\mathbf{|}}{\mathop{CH}}\,}}\,-C{{H}_{3}}}}\,\] (b) \[\underset{\begin{smallmatrix} \text{1 }\!\!{}^\circ\!\!\text{ }\,\text{alcohol} \\ (butanol\text{-}1) \end{smallmatrix}}{\mathop{C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}C{{H}_{2}}OH}}\,\] (c)\[\underset{\begin{smallmatrix} \text{1 }\!\!{}^\circ\!\!\text{ }\,\text{alcohol} \\ (iso-butanol) \end{smallmatrix}}{\mathop{C{{H}_{3}}-\overset{C{{H}_{3}}}{\mathop{\overset{|}{\mathop{CH}}\,}}\,-C{{H}_{2}}OH}}\,\] (d)\[\underset{\begin{smallmatrix} \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\text{3 }\!\!{}^\circ\!\!\text{ }\,\text{alcohol} \\ (2-methyl-2-propanol) \end{smallmatrix}}{\mathop{C{{H}_{3}}-\underset{OH}{\overset{C{{H}_{3}}}{\mathop{\underset{\mathbf{|}}{\overset{\mathbf{|}}{\mathop{C}}}\,}}}\,-C{{H}_{3}}}}\,\] Hence, 2-methyl-2-propanol (\[3{}^\circ \]alcohol) reacts with Lucas reagent fastly.
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