Among the following alcohols, select the one that would react fastest with conc. HCl and anhydrous ZnCl₂ is

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2-Butanol

2-Methylpropan-2-ol

2-Methylpropanol

1-Butanol

answer is B.

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Detailed Solution

Mixture of conc. HCl and anhydrous ZnCl₂ is a Lucas reagent and it is used to detect primary, secondary, and tertiary alcohol.

When tertiary alcohol reacts with Lucas reagent, then it immediately forms turbidity or cloudy appearance.
When secondary alcohol treated with Lucas reagent, then it forms turbidity or shows cloudy appearance after five minutes.
When primary alcohol is treated with Lucas reagent, then no turbidity occurs in-fact an oily layer generates.

Among the given compounds, 2-methyl propan-2-ol is tertiary alcohol and shows immediate reaction with Lucas reagent.

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