Among the following compounds, one that will not shown keto-enol tautomerism is

Options

A.
B.
C.
D.

Explanation

To determine which compound among the given options does not show keto-enol tautomerism, we need to analyze the presence of alpha-hydrogens in each compound. Keto-enol tautomerism occurs when there is an alpha-hydrogen available for the tautomerization process.

### Step-by-Step Solution:

1. **Identify the Compounds**: First, we need to examine the structures of the compounds provided in the question. Let's denote them as A, B, C, and D.

2. **Locate the Alpha Carbons**: For each compound, identify the alpha carbons. An alpha carbon is the carbon atom adjacent to the carbonyl group (C=O).

3. **Check for Alpha-Hydrogens**: Next, check if there are any alpha-hydrogens attached to the alpha carbons. The presence of at least one alpha-hydrogen is essential for keto-enol tautomerism to occur.

4. **Analyze Compound B**: In the analysis, it was noted that compound B does not have any alpha-hydrogens available. This means that it cannot undergo keto-enol tautomerism.

5. **Consider Stability of Tautomerization**: For the other compounds (A, C, and D), they all have alpha-hydrogens, and thus, they can undergo tautomerization. However, it was also mentioned that in certain cases (like with a bridgehead carbon), the formation of an enol may lead to instability, but this does not prevent tautomerism from occurring.

6. **Conclusion**: Based on the analysis, the compound that does not show keto-enol tautomerism is compound B, as it lacks alpha-hydrogens.

### Final Answer:
The compound that will not show keto-enol tautomerism is **Compound B**.