Question

From amongst the following alcohols the one that would react fastest with conc. HCl and anhydrous ZnCl₂, is

(1) 2–Butanol 

(2) 2–Methylpropan–2–ol 

(3) 2–Methylpropanol 

(4) 1–Butanol

Answer 1

(2)

3° alcohols react fastest with ZnCl₂/conc.HCl due to formation of 3° carbocation and\2–methyl propan–2–ol is the only 3° alcohol