What is the correct order of reactivity of alcohols

Question:

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

R—OH + HCl →(ZnCl2) R—Cl + H2O

(i) 1° > 2° > 3°

(ii) 1° < 2° > 3°

(iii) 3° > 2° > 1°

(iv) 3° > 1° > 2°

Solution:

Option (iii) 3° > 2° > 1° is the answer.

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