Which of the following will not give D.N.P test ?

Options

A. `CH_(3) - CHO`
B. `CH_(3) - CO - CH_(3)`
C. `CH_(3) -O-CH_(3)`
D.

Explanation

To determine which of the given compounds will not give a D.N.P (2,4-Dinitrophenylhydrazine) test, we need to understand the nature of the D.N.P test and the functional groups involved.

### Step-by-Step Solution:

1. **Understand the D.N.P Test**:
The D.N.P test is used to detect carbonyl groups (C=O) present in aldehydes and ketones. When these compounds react with 2,4-Dinitrophenylhydrazine, they form a yellow, orange, or red precipitate, indicating a positive test.

2. **Identify the Compounds**:
We need to analyze each compound provided in the question to see if they contain a carbonyl group (aldehyde or ketone).

3. **Analyze Each Compound**:
- **Compound 1: Ethanol (CH3CH2OH)**:
- Functional Group: Alcohol (not a carbonyl).
- D.N.P Test Result: Negative (does not give a D.N.P test).

- **Compound 2: Acetone (CH3C(=O)CH3)**:
- Functional Group: Ketone.
- D.N.P Test Result: Positive (gives a D.N.P test).

- **Compound 3: Methoxymethane (CH3OCH3)**:
- Functional Group: Ether.
- D.N.P Test Result: Negative (does not give a D.N.P test).

- **Compound 4: Benzaldehyde (C6H5CHO)**:
- Functional Group: Aldehyde.
- D.N.P Test Result: Positive (gives a D.N.P test).

4. **Conclusion**:
From the analysis, we find that:
- Ethanol and Methoxymethane do not give a D.N.P test.
- Acetone and Benzaldehyde do give a D.N.P test.
Therefore, the compound that will not give a D.N.P test is **Methoxymethane (option 3)**.

### Final Answer:
The compound that will not give a D.N.P test is **Methoxymethane (CH3OCH3)**.