The product of reaction,
`CH_3CH_2OH overset(Cu//300^@C)to`

Options

A. `C_2H_6`
B. `CH_3COCH_3`
C. `CH_3CHO`
D. `CH_3COOH`

Answer

To determine the product of the reaction of ethanol (CH₃CH₂OH) when passed over copper at 300°C, we need to understand the process of dehydrogenation.

### Step-by-Step Solution:

1. **Identify the Reactant**: The reactant is ethanol (CH₃CH₂OH), which is a primary alcohol.

2. **Understand the Reaction Conditions**: The reaction is carried out over copper (Cu) at a temperature of 300°C. This condition typically promotes dehydrogenation.

3. **Define Dehydrogenation**: Dehydrogenation is the removal of hydrogen (H₂) from the alcohol. In the case of primary alcohols, this process converts the alcohol into an aldehyde.

4. **Apply the Reaction to Ethanol**: When ethanol undergoes dehydrogenation, it loses two hydrogen atoms (one from the hydroxyl group and one from the adjacent carbon). The resulting product is acetaldehyde (CH₃CHO).

5. **Write the Balanced Reaction**:
\[ CH₃CH₂OH \overset{Cu, 300°C}{\rightarrow} CH₃CHO + H₂ \]

6. **Conclusion**: The product of the reaction of ethanol over copper at 300°C is acetaldehyde (CH₃CHO).

### Final Answer:
The product of the reaction is acetaldehyde (CH₃CHO).

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