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\[HCl+ZnC{{l}_{2}}\]. \[{{3}^{o}}\]alcohol\[+\]Lucas reagent\[\xrightarrow{{}}\]Immediate terbidity \[{{2}^{o}}\]alcohol\[+\]Lucas reagent\[\xrightarrow{{}}\]Terbidity after\[5-10\min \] \[{{1}^{o}}\]alcohol\[+\]Lucas reagent\[\xrightarrow{{}}\]No terbidity \[\underset{\begin{smallmatrix} (a) \\ {{1}^{o}}alcohol \end{smallmatrix}}{\mathop{C{{H}_{3}}C{{H}_{2}}OH}}\,\underset{\begin{smallmatrix} (b) \\ {{3}^{o}}alcohol \end{smallmatrix}}{\mathop{-\,\,\underset{\begin{smallmatrix} | \\ C{{H}_{3}} \end{smallmatrix}}{\overset{\begin{smallmatrix} C{{H}_{3}} \\ | \end{smallmatrix}}{\mathop{C}}}\,-OH}}\,\] \[\underset{{{2}^{o}}alcohol}{\mathop{C{{H}_{3}}-\underset{\begin{smallmatrix} | \\ H \end{smallmatrix}}{\overset{\begin{smallmatrix} C{{H}_{3}} \\ | \end{smallmatrix}}{\mathop{C}}}\,-OH}}\,\] \[\underset{\begin{smallmatrix} (d) \\ {{1}^{o}}alcohol \end{smallmatrix}}{\mathop{C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}OH}}\,\] \[\therefore \][b] a tertiary alcohol will give fastest reaction.
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