`CH_(3)CONH_(2)` is a weaker base than `CH_(3)CH_(2)NH_(2)`.

Explanation

To understand why \( CH_3CONH_2 \) (acetamide) is a weaker base than \( CH_3CH_2NH_2 \) (ethylamine), we can analyze the structures and electronic properties of these compounds step by step.

### Step 1: Identify the Compounds
- **Acetamide**: \( CH_3CONH_2 \)
- **Ethylamine**: \( CH_3CH_2NH_2 \)

### Step 2: Determine the Functional Groups
- **Acetamide** contains an amide functional group, which has a carbonyl group (C=O) bonded to a nitrogen atom.
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