Amongst the following alcohols which would react fastest with conc. $\mathrm{HCl}$ and $\mathrm{ZnCl}_2$ ?
Amongst the following alcohols which would react fastest with conc. $\mathrm{HCl}$ and $\mathrm{ZnCl}_2$ ?
pentanol
2-methyl butanol
2-pentanol
2-methyl butan-2-ol
Solution
$\mathrm{ZnCl}_2+$ conc. $\mathrm{HCl}$ is Lucas reagent. Lucas reagent reacts fastest with tertiary alcohol. $3^{\circ}$ alcohol $+$ Lucas reagent $=$ Immediate turbidity