Arrange the following alcohols in order of increasing reactivity towards Lucas reagent: 2-butanol, 1-butanol, 2-methyl-2-propanol.

Explanation

To arrange the alcohols 2-butanol, 1-butanol, and 2-methyl-2-propanol in order of increasing reactivity towards Lucas reagent, we need to understand the reactivity of different classes of alcohols (primary, secondary, and tertiary) when they react with Lucas reagent (which is a mixture of anhydrous ZnCl2 and HCl).

### Step-by-Step Solution:

1. **Identify the Types of Alcohols**:
- **1-butanol** is a primary alcohol (1°).
- **2-butanol** is a secondary alcohol (2°).
- **2-methyl-2-propanol** is a tertiary alcohol (3°).
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