Which of the following is the most reactive with HCl in the presence of `ZnCl_(2)`?

Options

A. `(CH_(3))_(3)COH`
B. `(CH_(3))_(2)CH-CH_(2)-CH_(2)-OH`
C. `(CH_(3))_(2)CHOH`
D. `C_(6)H_(5)OH`

Explanation

To determine which of the given compounds is the most reactive with HCl in the presence of ZnCl₂ (Lukas reagent), we need to analyze the reactivity of different types of alcohols (primary, secondary, and tertiary) and phenol with this reagent.

### Step-by-Step Solution:

1. **Identify the Types of Alcohols:**
- The compounds provided in the options are likely to include primary, secondary, and tertiary alcohols, as well as phenol.

2. **Understand the Reactivity with Lukas Reagent:**
- The Lukas reagent (HCl + ZnCl₂) is used to differentiate between primary, secondary, and tertiary alcohols.
- **Tertiary alcohols** react immediately with Lukas reagent, showing turbidity right away.
- **Secondary alcohols** show turbidity after a few minutes (3-5 minutes).
- **Primary alcohols** require heating to show turbidity, indicating a slower reaction.
- **Phenol** does not react with Lukas reagent.

3. **Analyze Each Compound:**
- **Tertiary Alcohol:** If the compound is a tertiary alcohol, it will react immediately, making it the most reactive.
- **Secondary Alcohol:** If the compound is a secondary alcohol, it will take longer to react compared to tertiary alcohols.
- **Primary Alcohol:** If the compound is a primary alcohol, it will require heating to react, making it the least reactive among the three types.
- **Phenol:** Phenol will not react with HCl and ZnCl₂, making it non-reactive.

4. **Conclusion:**
- Since tertiary alcohols react the fastest with Lukas reagent, the compound that is a tertiary alcohol is the most reactive with HCl in the presence of ZnCl₂.
- Therefore, the answer to the question is the **tertiary alcohol**.

### Final Answer:
The most reactive compound with HCl in the presence of ZnCl₂ is the **tertiary alcohol**.

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