Lucas reagent is

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(A) Lucas reagent is a solution of anhydrous $ZnCl_2$ in concentrated $HCl$. This reagent is used to classify alcohols of low molecular weight. The re

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Anhydrous $ZnCl_2$ + conc. $HCl$

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(A) Lucas reagent is a solution of anhydrous $ZnCl_2$ in concentrated $HCl$. This reagent is used to classify alcohols of low molecular weight. The reaction involves the substitution of the hydroxyl group $(-OH)$ with a chloride ion $(Cl^-)$. The reaction proceeds via an $SN1$ mechanism,where the rate of reaction depends on the stability of the carbocation intermediate. Tertiary alcohols react fastest,followed by secondary,while primary alcohols react very slowly or not at all at room temperature. Therefore,the correct composition is anhydrous $ZnCl_2$ and concentrated $HCl$.

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