Which of the following compounds reacts immediately with Lucas reagent ?

Options

A. `CH_(3)CH_(2) CH_(2)OH`
B. `CH_(3)- underset(OH)underset(|)(C)H - CH_(3)`
C. `CH_(3)- underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-OH`
D. `CH_(3)-underset(CH_3)(C)H-CH_(2)OH`

Answer

To determine which compound reacts immediately with Lucas reagent, we need to understand the reactivity of different types of alcohols (primary, secondary, and tertiary) with this reagent.

### Step-by-Step Solution:

1. **Understand Lucas Reagent**: Lucas reagent is a mixture of concentrated hydrochloric acid (HCl) and zinc chloride (ZnCl2). It is used to differentiate between primary, secondary, and tertiary alcohols based on their reactivity.

2. **Reactivity Order of Alcohols**: The order of reactivity of alcohols with Lucas reagent is:
- Tertiary alcohols react immediately.
- Secondary alcohols react within a few minutes (typically around 5 minutes).
- Primary alcohols require heating to react.

3. **Identify the Types of Alcohols**: We need to analyze the given options to identify which one is a tertiary alcohol:
- **Option A**: CH3CH2CH2OH (This is 1-propanol, a primary alcohol)
- **Option B**: CH3CHOHCH3 (This is 2-propanol, a secondary alcohol)
- **Option C**: CH3C(CH3)2OH (This is 2,2-dimethylpropan-2-ol, a tertiary alcohol)
- **Option D**: CH3CH(CH3)CH2OH (This is 2-methylpropan-1-ol, a primary alcohol)

4. **Determine the Correct Option**:
- From the analysis, we see that **Option C (2,2-dimethylpropan-2-ol)** is a tertiary alcohol. Therefore, it will react immediately with Lucas reagent.

5. **Conclusion**: The compound that reacts immediately with Lucas reagent is **Option C: CH3C(CH3)2OH**.