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The compound which reacts fastest with Lucas reagent at room temperature is

1. Butan-1-ol
2. Butan-2-ol
3. 2-Methylpropan-1-ol
4. 2-Methylpropan-2-ol

Correct answer: 2-Methylpropan-2-ol

Solution

Lucas reagent reacts fastest with tertiary alcohols due to the formation of a stable tertiary carbocation. Among the options, 2-Methylpropan-2-ol is a tertiary alcohol and reacts the fastest.

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