A) \[C{{H}_{3}}C{{H}_{2}}OH\]
B) \[{{(C{{H}_{3}})}_{3}}COH\]
C) \[{{(C{{H}_{3}})}_{2}}CHOH\]
D) \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}OH\]
Correct Answer: B
Solution :
Key Idea: Lucas reagent is used to distinguish between \[{{1}^{o}},{{2}^{o}}\]and\[{{3}^{o}}\]alcohols. Lucas reagent is\[HCl+ZnC{{l}_{2}}.\] [a]\[{{\text{3}}^{\text{o}}}\text{+}\,\,\text{alcohol}\,\text{+}\,\text{Lucas}\,\text{reagent}\,\xrightarrow{{}}\,\text{Immediate}\] \[\text{terbidity}\] [b] \[{{\text{2}}^{\text{o}}}\,\text{alcohol}\,\text{+}\,\text{Lucas}\,\text{reagent}\xrightarrow{{}}\text{Terbidity}\,\text{after}\] \[5-10\,\min \] [c] \[{{\text{1}}^{\text{o}}}\,\text{alcohol}\,\text{+}\,\text{Lucas}\,\text{reagent}\xrightarrow{{}}\text{No}\,\text{terbidity}\] \[\underset{{{1}^{o\,}}\text{alcohol}}{\mathop{\underset{(a)}{\mathop{C{{H}_{3}}C{{H}_{2}}OH}}\,}}\,\underset{{{3}^{o\,}}\text{alcohol}}{\mathop{\underset{(b)}{\mathop{C{{H}_{3}}-\underset{C{{H}_{3}}}{\overset{C{{H}_{3}}}{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,}}}\,-OH}}\,}}\,\]\[\underset{{{2}^{o\,}}\text{alcohol}}{\mathop{\underset{(c)}{\mathop{C{{H}_{3}}-\underset{H}{\overset{C{{H}_{3}}}{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,}}}\,-OH}}\,}}\,\underset{{{1}^{o\,}}\text{alcohol}}{\mathop{\underset{(d)}{\mathop{C{{H}_{3}}C{{H}_{2}}OH}}\,}}\,\] \[\therefore \] [b] a tertiary alcohol will give fastest reaction.
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