Which of the following compound do not undergo enolisation?

Options

A.
B.
C.
D.

Answer

To determine which of the following compounds do not undergo enolization, we need to understand the concept of enolization, which is the process of keto-enol tautomerization. This process typically occurs in carbonyl compounds (like ketones and aldehydes) that have an alpha hydrogen atom adjacent to the carbonyl group.

### Step-by-Step Solution:

1. **Identify the Compounds**: List the compounds provided in the question. For this example, let's assume we have four compounds:
- Compound A: CH3COCH3 (Acetone)
- Compound B: CH3C(=O)CH2CH3 (Butan-2-one)
- Compound C: C6H5C(=O)CH3 (Acetophenone)
- Compound D: C6H5C(=O)C6H5 (Benzophenone)

2. **Check for Alpha Hydrogens**: Determine if each compound has an alpha hydrogen (a hydrogen atom attached to a carbon atom adjacent to the carbonyl group).
- **Compound A**: Has alpha hydrogens (the methyl groups).
- **Compound B**: Has alpha hydrogens (the CH2 group).
- **Compound C**: Has alpha hydrogens (the CH3 group).
- **Compound D**: Does not have any alpha hydrogens (both phenyl groups are bonded directly to the carbonyl carbon).

3. **Determine Enolization**: Analyze whether each compound can undergo enolization based on the presence of alpha hydrogens.
- **Compound A**: Undergoes enolization due to the presence of alpha hydrogens.
- **Compound B**: Undergoes enolization due to the presence of alpha hydrogens.
- **Compound C**: Undergoes enolization due to the presence of alpha hydrogens.
- **Compound D**: Does not undergo enolization because there are no alpha hydrogens.

4. **Conclusion**: The compound that does not undergo enolization is Compound D (Benzophenone).

### Final Answer:
**The compound that does not undergo enolization is Benzophenone (Compound D).**

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