The strongest. hasc among the following compounds is
`NH_(3), H_(3)CNH_(2), (H_(3)C)_(2), NH, H_(5)C_(6)NH_(2)`

Explanation

To determine the strongest base among the given compounds: NH₃ (ammonia), H₃CNH₂ (methylamine), (H₃C)₂NH (dimethylamine), and H₅C₆NH₂ (aniline), we will analyze the basicity of each compound based on the structure and the influence of substituents on the nitrogen atom.

### Step-by-Step Solution:

1. **Identify the Compounds**:
- NH₃ (Ammonia)
- H₃CNH₂ (Methylamine)
- (H₃C)₂NH (Dimethylamine)
...