Correct order of Bond angle is

Options

A. `NO_(2)^(+) lt NO_(2) lt NO_(2)^(-)`
B. `BeCl_(2) gt BF_(3) lt CF_(4)`
C. `NH_(4)^(+) gt NH_(3) gt NH_(2)^(-)`
D. `OF_(2) gt OCl_(2) gt OBr_(2)`

Answer

To determine the correct order of bond angles for the given compounds, we need to analyze the molecular geometry and the presence of lone pairs and bond pairs in each case. Here is a step-by-step breakdown of the solution:

### Step 1: Identify the Molecular Shapes and Bond Angles
1. **Anode Positive (NO+)**: This molecule has a linear structure due to the presence of a positive charge on nitrogen, leading to a bond angle of **180°**.
2. **Anode 2 (NO2)**: This molecule has a bent shape due to one radical (odd electron) and a coordinate bond, resulting in bond angles less than **180°**.
3. **Anode 2 Negative (NO2-)**: This molecule has one lone pair and two bond pairs, leading to a bond angle less than **120°** due to lone pair-bond pair repulsion.
4. **BCl2**: This molecule is linear, resulting in a bond angle of **180°**.
5. **BF3**: This molecule is trigonal planar, resulting in a bond angle of **120°**.
6. **CF4**: This molecule is tetrahedral, resulting in a bond angle of approximately **109.28°**.
7. **NH4+**: This molecule is also tetrahedral, resulting in a bond angle of approximately **109.28°**.
8. **NH3**: This molecule has one lone pair, leading to a bond angle slightly less than **109.28°**.
9. **N2-**: This molecule has two lone pairs, leading to a bond angle less than that of NH3.
10. **OF2, OCl2, OBr2**: The bond angles will vary based on the electronegativity of the atoms involved, with OF2 having the smallest bond angle due to the high electronegativity of fluorine.

### Step 2: Compare the Bond Angles
- **Linear Molecules** (NO+, BCl2): **180°**
- **Trigonal Planar** (BF3): **120°**
- **Tetrahedral** (CF4, NH4+): **109.28°**
- **Ammonia (NH3)**: Slightly less than **109.28°**
- **Diatomic Nitrogen (N2-)**: Less than NH3 due to two lone pairs.
- **OF2**: Smaller than OCl2 and OBr2 due to the high electronegativity of fluorine.

### Step 3: Establish the Correct Order
Based on the analysis:
1. **180°** (NO+, BCl2)
2. **120°** (BF3)
3. **109.28°** (CF4, NH4+)
4. **<109.28°** (NH3)
5. ** 120° (BF3) > 109.28° (CF4, NH4+) > <109.28° (NH3) > OF2 < OCl2 < OBr2.**