Which one of the following alcohols reacts instantaneously with Lucas reagent? (Options are structur

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Question

Which one of the following alcohols reacts instantaneously with Lucas reagent? (Options are structures; answer is option 4, which is tertiary alcohol)

Accepted Answer

Correct Answer: d — Option 4 (tertiary alcohol)Step-by-step Solution:Lucas reagent is a mixture of concentrated hydrochloric acid (HCl) and anhydrous zinc chloride (ZnCl₂). It is used to distinguish between primary, secondary, and tertiary alcohols based on the rate of formation of alkyl chlorides (which are insoluble and form a cloudy solution). The reaction proceeds via an SN1 mechanism, where the rate depends on carbocation stability. Tertiary alcohols form very stable tertiary carbocations and react immediately at room temperature, producing turbidity instantly. Secondary alcohols react after a few minutes (5–10 minutes), and primary alcohols do not react at room temperature (require heating). Therefore, the alcohol that reacts instantaneously is a tertiary alcohol, which corresponds to option 4.Key Concepts: Lucas test for alcohols, SN1 mechanism, carbocation stability order: tertiary > secondary > primary, rate of reaction with Lucas reagent.

Which one of the following alcohols reacts instantaneously with Lucas reagent? (Options are structures; answer is option 4, which is tertiary alcohol)

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Which one of the following alcohols reacts instantaneously with Lucas reagent? (Options are structures; answer is option 4, which is tertiary alcohol)

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