Which of the following does not give haloform reaction:

Options

A. `underset(Cl)underset(|)(CH_(2))-underset(O)underset(||)(C)-CH_(3)`
B. `underset(Br)underset(|)(C)H-underset(O)underset(||)(C)-CH_(3)`
C. `underset(Cl)underset(|)(CH_(2))-overset(O)overset(||)(C)-CH_(3)`
D. `Ph-underset(O)underset(||)(C)-Ph`

Explanation

To determine which of the given compounds does not give a haloform reaction, we need to understand the conditions required for a compound to undergo this reaction.

### Step-by-Step Solution:

1. **Understand the Haloform Reaction**:
The haloform reaction occurs with compounds that contain the acetyl group (CH3CO-) or similar structures. Specifically, the compound must have a methyl ketone (RCOCH3) or a compound that can be oxidized to a methyl ketone.

2. **Identify the Required Functional Group**:
The key functional group for the haloform reaction is the presence of the acetyl group (CH3CO-). This means that for a compound to undergo the haloform reaction, it should have a structure that can be represented as RCOCH3.

3. **Analyze the Given Options**:
We need to look at each option provided in the question to see if they contain the required acetyl group.
- **Option A**: COCH3 (This is a methyl ketone and will undergo the haloform reaction.)
- **Option B**: COCH3 (This is also a methyl ketone and will undergo the haloform reaction.)
- **Option C**: COCH3 (This is again a methyl ketone and will undergo the haloform reaction.)
- **Option D**: CH3=O CH (This compound has a structure that does not contain the required CH3CO- group. It has two benzene rings and does not fit the criteria for the haloform reaction.)

4. **Conclusion**:
Since options A, B, and C all contain the necessary acetyl group (CH3CO-), they will undergo the haloform reaction. However, option D does not contain this group and therefore will not undergo the haloform reaction.

### Final Answer:
The correct answer is **Option D**, as it does not give a haloform reaction.

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