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

Options

A. Butan`-2-ol`
B. Butan`-1-ol`
C. 2-methyl propanol
D. 2-methyl propan`-2-ol`

Explanation

To determine which compound reacts fastest with Lucas reagent at room temperature, we need to understand how Lucas reagent works and the classification of alcohols.

### Step-by-Step Solution:

1. **Understanding Lucas Reagent:**
- Lucas reagent is a solution of anhydrous zinc chloride (ZnCl2) in concentrated hydrochloric acid (HCl). It is used to differentiate between primary (1°), secondary (2°), and tertiary (3°) alcohols.

2. **Reaction Characteristics:**
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