In lucas test immediately from alcohols by

Options

A. `3^(@)` alcohols
B. `2^(@)` alcohols
C. `1^(@)` alcohols
D. Phenol

Explanation

To solve the question regarding which type of alcohol shows an immediate positive result in the Lucas test, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Lucas Test**:
- The Lucas test is used to differentiate between primary, secondary, and tertiary alcohols. It involves the use of Lucas reagent, which is a mixture of concentrated hydrochloric acid (HCl) and anhydrous zinc chloride (ZnCl2).

**Hint**: Remember that the Lucas test is specifically designed to distinguish between different types of alcohols based on their reactivity.

2. **Reaction Mechanism**:
- When an alcohol (ROH) reacts with Lucas reagent, it forms an alkyl halide (RCl) and water. The general reaction can be represented as:
\[ \text{ROH} + \text{HCl} \rightarrow \text{RCl} + \text{H}_2\text{O} \]

**Hint**: Focus on the products formed from the reaction of alcohols with HCl.

3. **Carbocation Stability**:
- The reaction proceeds through the formation of carbocations. The stability of carbocations is crucial:
- Tertiary (3°) carbocations are the most stable.
- Secondary (2°) carbocations are less stable.
- Primary (1°) carbocations are the least stable.

**Hint**: Recall that the stability of carbocations affects the rate of reaction; more stable carbocations form more readily.

4. **Reactivity of Alcohols**:
- Tertiary alcohols will form tertiary carbocations immediately, leading to a rapid reaction and an immediate positive result (turbidity).
- Secondary alcohols will form secondary carbocations, which will react but take more time (show turbidity after some minutes).
- Primary alcohols will form primary carbocations, which are the least stable and thus do not show a positive result in a reasonable time frame.

**Hint**: Compare the reactivity of the different types of alcohols based on their carbocation stability.

5. **Conclusion**:
- Since tertiary alcohols show an immediate positive result in the Lucas test due to the formation of stable tertiary carbocations, the answer to the question is that **tertiary alcohols will show an immediate positive result in the Lucas test**.

**Final Answer**: The correct option is **tertiary alcohols (3° alcohols)**.