Arrange the following bases in order of decreasing basicity:
`S^(2-),CH_(3)COO^(Θ), CN^(Θ), NH_(3),F^(Θ)`

Explanation

To arrange the given bases in order of decreasing basicity, we need to analyze their corresponding acids and understand the relationship between the strength of acids and their conjugate bases. Here’s a step-by-step solution:

### Step 1: Identify the Conjugate Acids
First, we need to identify the conjugate acids for each of the bases provided:

1. **S^(2-)** → Conjugate acid: H2S
2. **CH3COO^(−)** → Conjugate acid: CH3COOH (acetic acid)
3. **CN^(−)** → Conjugate acid: HCN
...