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  4. Which will give turbidity fastest on reaction with Lucas reagent ?

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Q. Which will give turbidity fastest on reaction with Lucas reagent ?

UP CPMTUP CPMT 2009

Solution:

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