1) Unknown alcohol is treated with the "Lucas reagent" to determine whether the alcohol is primary, secondary or tertiary. Which alcohol reacts fastest and by what mechanism? A) Secondary alcohol by $S_{N}1$ B) Tertiary alcohol by $S_{N}1$ C) Secondary alcohol by $S_{N}2$ D) Tertiary alcohol by $S_{N}2$ Answer: Option BExplanation: This reaction of alcohol with Lucas reagent is mostly an SN1 reaction and rate of reaction is directly proportional to the stability of carbocation formed in the reaction. Since 3° R-OH forms 3° carbocation (most stable ) hence it will react fastest
