Select the correct statement(s) regarding `BF_(2)NH_(2)` molecule:

Options

A. FBF bond angle `lt120^(@)`
B. HNH bond angle `gt109^(@)28'`
C. HNH bond angle `lt109^(@)28'`
D. FBF bond angle `gt120^(@)`

Explanation

To determine the correct statements regarding the BF₂NH₂ molecule, we need to analyze its structure and bond angles. Here’s a step-by-step solution:

### Step 1: Draw the Structure of BF₂NH₂
1. **Identify the Atoms**: The molecule consists of boron (B), fluorine (F), nitrogen (N), and hydrogen (H).
2. **Count Valence Electrons**:
- Boron (B): 3 electrons
- Fluorine (F): 7 electrons × 2 = 14 electrons
- Nitrogen (N): 5 electrons
- Hydrogen (H): 1 electron × 2 = 2 electrons
- Total = 3 + 14 + 5 + 2 = 24 valence electrons.
3. **Construct the Lewis Structure**:
- Boron is the central atom bonded to two fluorine atoms and one nitrogen atom.
- Nitrogen is bonded to two hydrogen atoms.
- The structure can be represented as:
```
F
|
F--B--N--H
|
H
```

### Step 2: Analyze the Bond Angles
1. **FBF Bond Angle**:
- The FBF bond angle is expected to be around 120° due to the trigonal planar arrangement around boron.
- However, due to the polar nature of the BF bond (more polar than BN), the FBF bond angle is slightly less than 120°.
- **Conclusion**: FBF bond angle is less than 120° (Option 1 is correct).

2. **NH₂ Bond Angle**:
- The NH₂ group has a bent shape due to the presence of lone pairs on nitrogen.
- The bond angle in NH₂ is influenced by the repulsion between the lone pairs and the bonding pairs.
- The NH₂ bond angle is typically greater than the tetrahedral angle (109.5°) because the lone pairs occupy more space.
- **Conclusion**: NH₂ bond angle is greater than 109.5° (Option 2 is correct).

3. **Evaluate the Incorrect Statements**:
- Option 3 states that the NH₂ bond angle is smaller than 109.5° and the FBF bond angle is greater than 120°. This is incorrect based on our analysis.

### Final Conclusion
- The correct statements regarding the BF₂NH₂ molecule are:
- Option 1: FBF bond angle is less than 120° (Correct)
- Option 2: NH₂ bond angle is greater than 109.5° (Correct)
- Option 3: Incorrect

### Summary of Correct Options
- **Correct Options**: 1 and 2.

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