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Chemistry Question on Alcohols

Which will give turbidity fastest on reaction with Lucas reagent ?

A

CH3CH2OHCH_{3}CH_{2}OH

B

C

D

CH3CH2CH2OHCH_{3}CH_{2}CH_{2}OH

Answer

Explanation

Solution

Lucas test: A lcohols react w ith concentrated hydrochloric acid in presence of anhydrous zinc chloride to form alkyl halides R−OH+HCI−>[Zncl2]R−ClAlkyl halide+H2OR-OH+HCI { ->[Zncl_{2}] } \underset{\text{Alkyl halide}}{{R - Cl}}+H_{2}O The three types of alcohols undergo this reaction at different rates. The rates of reaction with Lucas reagent, [conc. HCl+ZnCl2HCl+ZnCl_{2} (anhydrous)) follow the order : 3∘> 2∘> 1∘3^{\circ}>\,2^{\circ}>\,1^{\circ}