Ncert Exercises & Solutions

What is the correct order of reactivity of alcohols in the following reaction?
$R - OH + HCl \overset{{ZnCl}_{2}}{\to} R - Cl + H_{2} O$

(1)1° > 2°> 3°

(2) 1° < 2°> 3°

(3)3°> 2°> 1°

(4)3°> 1°> 2°

Hint: Lucas Reagent

The given reaction is nucleophilic substitution reaction in which -OH group is replaced by -Cl. Tertiary alcohols, when react with HCI in presence of ${ZnCl}_{2}$ form tertiary carbocation.

This intermediate 3° carbocation is more stable than 2° carbocation as well as 1° carbocation. Higher the stability of intermediate, higher will be the reactivity of reactant molecule

So, the order of reactivity of alcohols in the given reaction is 3° > 2°> 1° and correct

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