On treatment with Lucas reagent, there is an appearnce of a precipitate at once. This is a:

Engineering

Chemistry

Test of alcohol

Distinction tests

Question

On treatment with Lucas reagent, there is an appearnce of a precipitate at once. This is a:

secondary alcohol

tertiary alcohol

primary alocohol

none

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The Lucas test distinguishes alcohols based on their reactivity with Lucas reagent (ZnCl₂ in concentrated HCl). Tertiary alcohols react fastest, forming an insoluble alkyl chloride precipitate immediately. Secondary alcohols take 5-10 minutes, while primary alcohols require heating. Since a precipitate forms at once, it indicates a tertiary alcohol.

Reaction: $R {COH}_{3} + HCl \overset{ZnC l_{2}}{\to} R Cl + H_{2} O$

Final Answer: tertiary alcohol