Which of the following will react fastest with Lucas reagent?

Butan-l-ol

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Butan-2-ol

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2-Methyl propane -2-ol

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2-Methyl propane

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Solution

The correct option is C 2-Methyl propane -2-ol
Lucas reagent is the mixture of anhydrous $Z n C l_{2} +$ conc. HCI= 1:1.
The order of reactivity is $3^{\circ} > 2^{\circ} > 1^{\circ}$ alcohol.
Hence, option (C) which is a $3^{\circ}$ alcohol is the correct answer of this question.

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