`C_(4)H_(11)N` can represent :

Options

A. Total structural amines are eight
B. `1^(@)` amines are four
C. `2^(@)` amines are three
D. `3^(@)` amine is one

Explanation

To determine the possible representations of the compound with the formula \( C_4H_{11}N \), we will analyze the different types of amines: primary (1°), secondary (2°), and tertiary (3°) amines.

### Step 1: Identify the types of amines
- **Primary amine (1°)**: The general structure is \( RNH_2 \).
- **Secondary amine (2°)**: The general structure is \( R_1NHR_2 \).
- **Tertiary amine (3°)**: The general structure is \( R_1R_2R_3N \).

### Step 2: Analyze the primary amine
For a primary amine, we need one \( NH_2 \) group. This leaves us with \( C_4H_9 \) (since \( C_4H_{11}N - NH_2 = C_4H_9 \)).

1. **Structure 1**: \( CH_3-CH_2-CH_2-CH_2-NH_2 \) (Butylamine)
2. **Structure 2**: \( CH_3-CH-CH_2-NH_2 \) (Isobutylamine)
3. **Structure 3**: \( CH_3-CH_2-CH(NH_2)-CH_3 \) (Sec-butylamine)
4. **Structure 4**: \( CH_3-CH(NH_2)-CH_3 \) (Tert-butylamine)

Total primary amines = 4.

### Step 3: Analyze the secondary amine
For a secondary amine, we need one \( NH \) group. This leaves us with \( C_4H_{10} \) (since \( C_4H_{11}N - NH = C_4H_{10} \)).

1. **Structure 1**: \( CH_3-CH_2-NH-CH_3 \) (Ethylmethylamine)
2. **Structure 2**: \( CH_3-CH-CH_3-NH-CH_3 \) (Dimethylamine)
3. **Structure 3**: \( CH_3-CH_2-NH-CH_2-CH_3 \) (Diethylamine)

Total secondary amines = 3.

### Step 4: Analyze the tertiary amine
For a tertiary amine, we need just \( N \) with three substituents. This leaves us with \( C_4H_{11} \) itself.

1. **Structure**: \( N(CH_3)_3 \) (Trimethylamine)

Total tertiary amines = 1.

### Step 5: Summarize the findings
- Total primary amines = 4
- Total secondary amines = 3
- Total tertiary amines = 1

### Conclusion
The compound \( C_4H_{11}N \) can represent:
- 4 primary amines
- 3 secondary amines
- 1 tertiary amine

Thus, \( C_4H_{11}N \) can represent a total of 8 different structural isomers.

---