The number of all primary amines possible with the molecular formula `C_(3)H_(9)N` and the primary amine with amino group on a primary carbon atom is given by the set :-

Options

A. `4,1`
B. `2,1`
C. `3,2`
D. `2,2`

Answer

To solve the problem of finding the number of primary amines possible with the molecular formula \( C_3H_9N \) and the primary amine with the amino group on a primary carbon atom, we can follow these steps:

### Step 1: Understand the Structure of Primary Amines
A primary amine is characterized by the presence of an amino group (\(-NH_2\)) attached to a carbon atom that is bonded to only one other carbon atom. This means that in a primary amine, the nitrogen is connected to one carbon atom and two hydrogen atoms.

### Step 2: Determine the Possible Structures
Given the molecular formula \( C_3H_9N \), we can start by constructing the possible structures of primary amines. The carbon skeleton can be arranged in different ways, but we need to ensure that the amine group is attached to a primary carbon.

1. **Propylamine (1-aminopropane)**:
- Structure: \( CH_3-CH_2-CH_2-NH_2 \)
- This is a primary amine because the nitrogen is attached to a carbon that is connected to two hydrogens and one carbon.

2. **Isopropylamine (2-aminopropane)**:
- Structure: \( (CH_3)_2CH-NH_2 \)
- This is not a primary amine because the nitrogen is attached to a carbon that is connected to two other carbon atoms.

### Step 3: Count the Primary Amines
From the above analysis, we find that only one primary amine structure is possible with the formula \( C_3H_9N \):
- **1-aminopropane** (or propylamine).

### Step 4: Identify Primary Amines with Amino Group on Primary Carbon
Now, we need to find the primary amine that has the amino group attached to a primary carbon. In our case, the only structure we identified is:
- **1-aminopropane**.

### Conclusion
Thus, the number of primary amines possible with the molecular formula \( C_3H_9N \) is **1**, and the primary amine with the amino group on a primary carbon is also **1**.

### Final Answer
- Total primary amines: **1**
- Primary amine with amino group on a primary carbon: **1**