A fast substitution reaction ensues when a certain alcohol is tested with Lucas

Question

A fast substitution reaction ensues when a certain alcohol is tested with Lucas Reagent (concentrated HCl and ZnCl2). An upper layer of an alkyl chloride will form and may be seen (depending of course on the amounts of reagents used). Which alcohol is likely to react fastest with Lucas Reagent?

a. a primary alcohol (like 1-butanol, CH3CH2CH2CH2OH)

b. a secondary alcohol (like 2-butanol, CH3CHOHCH2CH3)

c. a tertiary alcohol (like tert-butyl alcohol, (CH3)COH)

d. All of them will react at the same rate

Explanation / Answer

Lucas Reagent (concentrated HCl and ZnCl2)

a tertiary alcohol is likely to react fastest with Lucas Reagent.

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