Which alcohol gives turbidity immediately (within seconds) at room temperature with Lucas reagent (conc. $\mathrm{HCl}$ and anhydrous $\mathrm{ZnCl}{}_2$)?

The Lucas test works by ${\mathrm{S}}_{\mathrm{N}}1$ conversion of the alcohol to an insoluble alkyl chloride; the rate follows carbocation stability. Tertiary alcohols react at once, secondary alcohols in about five minutes, primary alcohols not at room temperature. Only 2-methylpropan-2-ol is tertiary.