Chemistry - ALCOHOL & ETHER Question with Solution | TestHub
On treatment with Lucas reagent, there is an appearance of a precipitate at once. This is a:
Options:
Answer:
Solution:
Lucas reagent is a solution of anhydrous zinc chloride () in concentrated hydrochloric acid (HCl). It is used to differentiate between primary, secondary, and tertiary alcohols. The reaction involves the conversion of the alcohol to an alkyl chloride, which is insoluble in the aqueous mixture and thus appears as a precipitate (turbidity).
Tertiary alcohols react fastest with Lucas reagent because they form the most stable carbocations. Primary alcohols react very slowly or not at all at room temperature. Secondary alcohols react at an intermediate rate.
The order of reactivity is: tertiary > secondary > primary
Since the precipitate appears immediately, it indicates a fast reaction, which is characteristic of a tertiary alcohol.
Therefore, the answer is C.