Carry out the following transformation in not more than three steps.
`CH_(3)-CH_(2)-C-=C-H rarr`
`CH_(3)-CH_(2)-CH_(2)-overset(O)overset(||)C-CH_(3)`

Explanation

To carry out the transformation from but-1-yne (CH₃-CH₂-C≡C-H) to pentane-2-one (CH₃-CH₂-CO-CH₂-CH₃) in not more than three steps, we can follow the steps outlined below:

### Step 1: Formation of Carbanion
1. **React but-1-yne with sodium amide (NaNH₂) in liquid ammonia (NH₃)**.
- Sodium amide is a strong base that will deprotonate the terminal alkyne (but-1-yne), resulting in the formation of a carbanion.
- The reaction can be represented as:
\[
\text{CH}_3-\text{CH}_2-\text{C}\equiv\text{C}-\text{H} + \text{NaNH}_2 \rightarrow \text{CH}_3-\text{CH}_2-\text{C}^- + \text{NH}_3
...