What is the correct order of reactivity of alcohols in the following reaction? 

R - OH   +    HCl R - Cl   +   H₂O

I. 1° > 2° > 3°

II. 1° < 2° > 3° 

III. 3° > 2° > 1°

IV. 3° > 1° > 2° 

<p><span data-teams="true">This is a multiple choice answer as classified in NCERT Exemplar</span></p><p> (III) 3° &gt; 2° &gt; 1°&nbsp;</p><p>Alcohols are classified as primary, secondary and tertiary by lucas reagent which is a mixture of concentrated HCl and dry anhydrous ZnCl₂. The carbocation is formed as the intermediate during the lucas test of alcohol.More the stability of intermediate carbocation, more will be the reactivity of alcohol.&nbsp;</p><p>Tertiary carbocation is most stable then the secondary alcohol is stable&nbsp; due to hyperconjugation and the primary alcohol is the least stable.</p><p>Stability of intermediate carbocation:</p><p>3° &gt; 2° &gt; 1°&nbsp;</p><p>Reactivity of alcohol:</p><p>3° &gt; 2° &gt; 1°&nbsp;</p>

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