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  4. From amongst the following alcohols the one that would react fastest with conc. HCl and anhydrous ZnCl2, is

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Q. From amongst the following alcohols the one that would react fastest with $conc. HCl$ and anhydrous $ZnCl_2$, is

AIEEEAIEEE 2010Alcohols Phenols and Ethers

Solution:

The reagent, conc.HCl and anhydrous $ZnCl_2$ is Lucas reagent, which is used to distinguish between $1^{\circ}$, $2^{\circ}$ and $3^{\circ}$ alcohols.
$3^{\circ}$ alcohol + Lucas reagent $\to$ Immediate turbidity.
$2^{\circ}$ alcohol + Lucas reagent $\to$ Turbidity after 5 mins.
$1^{\circ}$ alcohol + Lucas reagent $\to$ No reaction.
The required alcohol is 2-methylpropan-2-ol, i.e.,