. Which of the following is more easily enolised?
a. Cyclobutenone
b. Triketo cyclobutane

Explanation

To determine which compound is more easily enolized between cyclobutenone and triketocyclobutane, we will analyze the structures and stability of their enol forms.

### Step 1: Analyze Cyclobutenone
- **Structure**: Cyclobutenone has a cyclic structure with one ketone group. The carbon adjacent to the carbonyl (the alpha carbon) has hydrogen atoms.
- **Tautomerization**: Cyclobutenone can undergo tautomerization to form an enol. The enol form would involve the movement of a hydrogen atom from the alpha carbon to the carbonyl oxygen, resulting in a double bond between the alpha carbon and the carbonyl carbon.
- **Stability of Enol Form**: The enol form of cyclobutenone is anti-aromatic due to the cyclic structure and the presence of an even number of pi electrons (4 pi electrons). According to Huckel's rule, anti-aromatic compounds are less stable and therefore less favorable.

### Step 2: Analyze Triketocyclobutane
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