Distingusih between `1^(@), 2^(@), and 3^(@)` amines by `HNO_(2)` acid test.

Explanation

To distinguish between primary (1°), secondary (2°), and tertiary (3°) amines using the HNO₂ (nitrous acid) test, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Reaction with HNO₂:**
- HNO₂ is prepared by mixing sodium nitrite (NaNO₂) with hydrochloric acid (HCl). This generates nitrous acid (HNO₂), which reacts differently with amines based on their classification (1°, 2°, or 3°).

2. **Reaction of Primary Amines (1°):**
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