Which one is a mixed ketone :

Options

A. Benzophenone
B. acetone
C. Acetophenone
D. Dibenzyl ketone

Explanation

To determine which of the given compounds is a mixed ketone, we need to understand the definition of a mixed ketone. A mixed ketone is a ketone where the two alkyl (or aryl) groups attached to the carbonyl carbon (C=O) are different from each other.

Let’s analyze each option step by step:

1. **Benzophenone**:
- Structure: It has two phenyl (benzene) groups attached to the carbonyl carbon.
- Formula: C6H5C(=O)C6H5
- Since both groups are the same (phenyl groups), benzophenone is not a mixed ketone.

2. **Acetone**:
- Structure: It has two methyl (CH3) groups attached to the carbonyl carbon.
- Formula: CH3C(=O)CH3
- Again, both groups are the same (methyl groups), so acetone is not a mixed ketone.

3. **Acetophenone**:
- Structure: It has one phenyl (C6H5) group and one methyl (CH3) group attached to the carbonyl carbon.
- Formula: C6H5C(=O)CH3
- Since the two groups are different (phenyl and methyl), acetophenone is a mixed ketone.

4. **Dibenzyl Ketone**:
- Structure: It has two benzyl (C6H5CH2) groups attached to the carbonyl carbon.
- Formula: C6H5CH2C(=O)C6H5CH2
- Since both groups are the same (benzyl groups), dibenzyl ketone is not a mixed ketone.

**Conclusion**: The mixed ketone among the options is **acetophenone**.