`CH_(2)=CH^(-)` is a better nucleophile than `HC -= C^(-)`. Explain.

Explanation

To understand why \( CH_2=CH^- \) is a better nucleophile than \( HC \equiv C^- \), we need to analyze the acidity of the corresponding acids and the basicity of the conjugate bases.

### Step 1: Identify the acids
The conjugate acids of the nucleophiles are:
- For \( CH_2=CH^- \), the conjugate acid is \( CH_2=CH_2 \) (ethene).
- For \( HC \equiv C^- \), the conjugate acid is \( HC \equiv CH \) (ethyne).

### Step 2: Compare the acidity of the conjugate acids
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