A) butanol-2
B) butanol-1
C) 150-butanol
D) 2-methyl-2-propanol
Correct Answer: D
Solution :
Among the\[1{}^\circ ,\,\,2{}^\circ \]and\[3{}^\circ \]alcohols,\[3{}^\circ \]alcohols react with Lucas reagent readily and give turbidity while 2° give turbidity after 5 min and\[1{}^\circ \]do not react at room temperature. (a)\[\underset{\begin{smallmatrix} {{2}^{o}}alcohol \\ (butanol-2) \end{smallmatrix}}{\mathop{C{{H}_{3}}C{{H}_{2}}-\underset{\begin{smallmatrix} | \\ OH \end{smallmatrix}}{\mathop{CH}}\,-C{{H}_{3}}}}\,\] (b)\[\underset{\begin{smallmatrix} {{1}^{o}}alcohol \\ (butanol-1) \end{smallmatrix}}{\mathop{C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}C{{H}_{2}}OH}}\,\] (c)\[\underset{\begin{smallmatrix} {{1}^{o}}\,alcohol \\ (iso-butanol) \end{smallmatrix}}{\mathop{C{{H}_{3}}-\overset{\begin{smallmatrix} C{{H}_{3}} \\ | \end{smallmatrix}}{\mathop{CH}}\,-C{{H}_{2}}OH}}\,\] (d)\[\underset{\begin{smallmatrix} {{3}^{o}}alcohol \\ (2-methyl-2-propanol) \end{smallmatrix}}{\mathop{C{{H}_{3}}-\underset{\begin{smallmatrix} | \\ OH \end{smallmatrix}}{\overset{\begin{smallmatrix} C{{H}_{3}} \\ | \end{smallmatrix}}{\mathop{C}}}\,-C{{H}_{3}}}}\,\] Hence, 2-methyl-2-propanol (3° alcohol) reacts with Lucas reagent fastly.
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