A) 1-butanol
B) 2-butanol
C) 2-methyl-2-propanol
D) 2-methyl-1-propanol
Correct Answer: C
Solution :
\[\underset{{{\text{1}}^{\text{o}}}\,\text{alcohol}}{\mathop{\text{C}{{\text{H}}_{3}}C{{H}_{2}}C{{H}_{2}}-OH}}\,\] \[C{{H}_{3}}C{{H}_{2}}\underset{\begin{smallmatrix} OH \\ {{2}^{o}}\, \\ \text{alcohol} \end{smallmatrix}}{\mathop{\underset{|}{\mathop{C}}\,}}\,HC{{H}_{3}}\] \[C{{H}_{3}}-\underset{\begin{smallmatrix} \,\,\,\,\,\,\,\,\,OH \\ {{3}^{o\,}}\text{alcohol} \end{smallmatrix}}{\overset{\,\,\,\,\,\,\,\,\,C{{H}_{3}}}{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,}}}\,-C{{H}_{3}}\] \[C{{H}_{3}}\underset{\begin{smallmatrix} \,\,\,\,\,\,\,\,\,\,C{{H}_{3}} \\ {{1}^{o}}\,\text{alcohol} \end{smallmatrix}}{\mathop{\underset{|}{\mathop{C}}\,}}\,H-C{{H}_{2}}OH\] The reactivity of Lucas reagent with alcohol is \[{{3}^{o}}>{{2}^{o}}>{{1}^{o}}.\] Hence, 2-methyl-2-propanol reacts fastest with Lucas reagent.
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