Which of the following is not true in case of reaction with heated copper at `300^(@)C` ?

Options

A. Phenol `to` Benzyl alcohol
B. Secondary alcohol `to` Ketone
C. Primary alcohol `to` Aldehyde
D. Tertiary alcohol `to` Olefin .

Answer

To solve the question regarding the reactions of alcohols and phenols with heated copper at 300°C, we need to analyze the behavior of different types of alcohols and phenols under these conditions.

### Step-by-Step Solution:

1. **Understanding the Reaction Conditions**:
- We are heating copper at 300°C. This temperature is significant for the dehydration reactions of alcohols.

2. **Primary Alcohols**:
- When a primary alcohol is heated with copper at 300°C, it undergoes oxidation to form an aldehyde.
- **Example**: Ethanol (a primary alcohol) will convert to acetaldehyde.

3. **Secondary Alcohols**:
- Secondary alcohols, when heated with copper at this temperature, are oxidized to form ketones.
- **Example**: Isopropanol (a secondary alcohol) will convert to acetone.

4. **Tertiary Alcohols**:
- Tertiary alcohols undergo dehydration to form olefins (alkenes) when heated with copper at 300°C.
- **Example**: Tertiary butyl alcohol will convert to isobutylene.

5. **Phenols**:
- When phenol is heated with copper at 300°C, it does not convert to benzyl alcohol. This reaction does not occur under these conditions.
- **Conclusion**: The statement that phenol can be converted to benzyl alcohol by heating with copper at 300°C is **not true**.

6. **Identifying the Incorrect Statement**:
- Based on the above reactions, the statement regarding the conversion of phenol to benzyl alcohol is the only one that is incorrect.

### Final Answer:
The statement that is not true in the case of reaction with heated copper at 300°C is that phenol can be converted to benzyl alcohol.

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