Which alcohol reacts most readily with Lucas | vedclass

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(B) Lucas reagent is a mixture of concentrated $HCl$ and anhydrous $ZnCl_2$. The reaction proceeds via an $S_N1$ mechanism,where the rate-determining

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$p-$methoxy benzyl alcohol

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(B) Lucas reagent is a mixture of concentrated $HCl$ and anhydrous $ZnCl_2$. The reaction proceeds via an $S_N1$ mechanism,where the rate-determining step is the formation of a carbocation.Therefore,the alcohol that forms the most stable carbocation will react most readily.In $p-$methoxy benzyl alcohol,the methoxy group $(-OCH_3)$ is an electron-donating group by resonance ($+M$ effect),which significantly stabilizes the resulting benzyl carbocation.Benzyl alcohol and Allyl alcohol also form stable carbocations,but the presence of the $+M$ group in $p-$methoxy benzyl alcohol makes its carbocation the most stable among the given options.Vinyl alcohol is unstable and exists as acetaldehyde,so it does not undergo this reaction.

Which alcohol reacts most readily with Lucas reagent?

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