A) butan-1-ol
B) butan-2-ol
C) 2-methyl propan-1-ol
D) 2-methyl propan-2-ol
Correct Answer: D
Solution :
Lucas reagent (anhydrous\[ZnC{{l}_{2}}+conc.\,HCl\]) is used to distinguish between primary, secondary and tertiary alcohols. It reacts with \[3{}^\circ \]-alcohol readily giving white turbidity, with \[2{}^\circ \]-alcohol it gives turbidity after 1-2 minutes. While with \[1{}^\circ \]-alcohol, it reacts only on heating. Hence, it will react with 2-methyl propanal-2-ol fastest. \[\underset{\text{2-}\,\text{methyl}\,\text{propanol-2}}{\mathop{C{{H}_{3}}--\underset{C{{H}_{3}}}{\overset{C{{H}_{3}}}{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,}}}\,--OH}}\,\xrightarrow{ZnC{{l}_{2}}/conc.\,HCl}\] \[\underset{\text{white}\,\,\text{turbidity}\,\text{(immediately)}}{\mathop{C{{H}_{3}}--\underset{C{{H}_{3}}}{\overset{C{{H}_{3}}}{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,}}}\,--Cl+{{H}_{2}}O}}\,\]
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