Question

Amongst the following alcohols which would react fastest with cone. HCl and ZnCl₂?

Options

• pentanol

• 2-methyl butanol

• 2-pentanol

• 2-methyl butan-2-ol

Answer 1

2-methyl butan-2-ol

Explanation:

ZnCl₂ + cone. HCl is Lucas reagent. Tertiary alcohol causes the fastest reaction with the Lucas reagent.

3° alcohol + Lucas reagent = Immediate turbidity