Question

The compound which reacts fastest with Lucas reagent at room temperature is:

• A. $\text{Butan-1-ol}$
• B. $\text{Butan-2-ol}$
• C. $\text{2-methylpropan-1-ol}$
• D. $\text{2-methylpropan-2-ol}$

Answer 1

The correct option is D $\text{2-methylpropan-2-ol}$

Tertiary alcohol reacts fastest with Lucas reagent at room temperature, $\text{2-methyl propan-2-ol}$ is a tertiary alcohol, thus reacts immediately with Lucas reagent since it goes through SN1 mechanism.
$\text{2-Methylpropan-2-ol}$ reacts rapidly with Lucas reagent at room temperature.