Which one of the following is mixed ketone (Aliphatic & aromatic):

Options

A. `CH_(3) - overset(O)overset(||)(C ) - CH_(3)`
B. `CH_(3) - CH_(2) - overset(O)overset(||)(C ) - CH_(3)`
C. `Ph - overset(O)overset(||)(C ) - CH_(3)`
D. `CH_(3) - C_(6)H_(4) - overset(O)overset(||)(C ) - CH_(2) Ph`

Answer

To determine which of the given compounds is a mixed ketone (containing both aliphatic and aromatic groups), we need to analyze the structures of the compounds provided in the options. A mixed ketone is defined as a ketone that has one aliphatic (alkyl) group and one aromatic (aryl) group.

### Step-by-Step Solution:

1. **Understand the Definition of a Mixed Ketone**:
- A mixed ketone is a compound that has both an aliphatic (alkyl) group and an aromatic (aryl) group attached to the carbonyl (C=O) functional group. The general structure can be represented as R-C(=O)-R', where R is an aliphatic group and R' is an aromatic group.

2. **Analyze the Given Options**:
- We need to look at each option provided and identify whether it contains both an aliphatic and an aromatic group.

3. **Example Structures**:
- Let's consider a few examples:
- **Aliphatic Ketone**: For instance, CH3-C(=O)-CH3 (acetone) has two methyl (alkyl) groups, hence it is not a mixed ketone.
- **Aromatic Ketone**: For example, C6H5-C(=O)-CH3 (acetophenone) has a phenyl (aromatic) group and a methyl (alkyl) group, making it a mixed ketone.

4. **Identifying the Mixed Ketone**:
- If we have a compound like C6H5-C(=O)-CH2-CH3, we can see that:
- One side of the carbonyl (C=O) has a phenyl group (aromatic).
- The other side has an ethyl group (aliphatic).
- This structure fits the definition of a mixed ketone.

5. **Conclusion**:
- Based on the analysis, the compounds that contain both aliphatic and aromatic groups attached to the carbonyl carbon are classified as mixed ketones. Therefore, the correct options that represent mixed ketones are those that show this combination.

### Final Answer:
The mixed ketone(s) among the options provided is (are) **Option C and Option D**.