The compound having the molecular formula `C_(3)H_(9)N` can represent

Options

A. Trimethylamine
B. n-propylamine
C. Isopropylamine
D. All the three

Answer

To determine which compounds can represent the molecular formula \( C_3H_9N \), we will analyze each of the given compounds: trimethylamine, n-propyl amine, and isopropyl amine.

### Step 1: Analyze Trimethylamine
- **Structure**: Trimethylamine consists of one nitrogen atom bonded to three methyl groups.
- **Chemical Representation**:
\[ \text{(CH}_3\text{)}_3\text{N} \]
- **Counting Atoms**:
- Carbon (C): 3 (from three CH₃ groups)
- Hydrogen (H): 9 (3 from each CH₃, so \( 3 \times 3 = 9 \))
- Nitrogen (N): 1
- **Conclusion**: This compound has the formula \( C_3H_9N \).

### Step 2: Analyze n-Propyl Amine
- **Structure**: n-Propyl amine consists of a straight chain of three carbon atoms with an amine group (NH₂) at the end.
- **Chemical Representation**:
\[ \text{CH}_3\text{CH}_2\text{CH}_2\text{NH}_2 \]
- **Counting Atoms**:
- Carbon (C): 3 (from CH₃, CH₂, CH₂)
- Hydrogen (H): 9 (3 from CH₃ + 2 from first CH₂ + 2 from second CH₂ + 2 from NH₂)
- Nitrogen (N): 1
- **Conclusion**: This compound also has the formula \( C_3H_9N \).

### Step 3: Analyze Isopropyl Amine
- **Structure**: Isopropyl amine has a branched structure with two methyl groups and one methylene group connected to the nitrogen.
- **Chemical Representation**:
\[ \text{(CH}_3\text{)}_2\text{CH}\text{NH}_2 \]
- **Counting Atoms**:
- Carbon (C): 3 (2 from the two CH₃ groups and 1 from the CH group)
- Hydrogen (H): 9 (3 from each CH₃, 2 from the CH, and 2 from NH₂)
- Nitrogen (N): 1
- **Conclusion**: This compound also has the formula \( C_3H_9N \).

### Final Conclusion
Since all three compounds (trimethylamine, n-propyl amine, and isopropyl amine) have the molecular formula \( C_3H_9N \), the answer is that all three can represent the given molecular formula.

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