The reagent involved in Lucas test is
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Conc. \(HCl\) and anhydrous \(ZnCl_2\)
The Lucas test distinguishes primary, secondary and tertiary alcohols by how fast they react with HCl. The Lucas reagent is concentrated HCl with anhydrous \( \ce{ZnCl2} \); zinc chloride, a Lewis acid, helps break the C–O bond:
\( \displaystyle \ce{R-OH + HCl} \xrightarrow{\text{anhyd. }\ce{ZnCl2}} \ce{R-Cl + H2O} \)
NCERT (2026-27 edition):
Chemical Reactions – …
