Select correct order between given compounds .

Options

A. `COCl_(2)gtCOF_(2)` : `XCX` bond angle
B. `NO_(2)FgtNO_(2)Cl` : `ONO` bond angle
C. `SO_(2)F_(2)ltSOF_(2)` : `FSF` bond angle
D. `N_(2)F_(2)ltN_(2)(CH_(3))_(2)` : `N-N` bond length

Answer

To solve the problem of determining the correct order between the given compounds based on bond angles and bond lengths, we will analyze each option step by step.

### Step 1: Analyze CoCl2 vs CoF2
- **Geometry**: Both CoCl2 and CoF2 have a trigonal planar geometry.
- **Electronegativity**: Fluorine is more electronegative than chlorine. This means that in CoF2, the presence of two electronegative fluorine atoms will cause the bond angles to shrink due to increased electron repulsion.
- **Conclusion**: The bond angle in CoCl2 (Cl-Cl) will be greater than that in CoF2 (F-F).
- **Order**: CoCl2 > CoF2

### Step 2: Analyze NO2F vs NO2Cl
- **Hybridization**: The nitrogen in both NO2F and NO2Cl is sp2 hybridized, leading to a trigonal planar geometry.
- **Electronegativity**: Fluorine is more electronegative than chlorine, which means the bond angle in NO2F will be larger due to the increased bond length caused by the electronegativity difference.
- **Conclusion**: The ONO bond angle in NO2F will be greater than in NO2Cl.
- **Order**: NO2F > NO2Cl

### Step 3: Analyze SO2F2 vs SOF2
- **Hybridization**: Both SO2F2 and SOF2 have a steric number of 4, indicating sp3 hybridization.
- **Lone Pair Repulsion**: In SO2F2, there are no lone pairs on the sulfur atom, while in SOF2, there is one lone pair. The presence of a lone pair in SOF2 will cause greater repulsion, decreasing the bond angle.
- **Conclusion**: The bond angle in SO2F2 will be greater than in SOF2.
- **Order**: SO2F2 > SOF2

### Step 4: Analyze N2F2 vs N2(CH3)2
- **Electronegativity**: Fluorine is more electronegative than carbon. The NN bond in N2F2 will be shorter due to the higher electronegativity of fluorine compared to the methyl groups in N2(CH3)2.
- **Conclusion**: The NN bond length in N2F2 will be less than that in N2(CH3)2.
- **Order**: N2F2 < N2(CH3)2

### Final Summary of Orders
1. CoCl2 > CoF2
2. NO2F > NO2Cl
3. SO2F2 > SOF2
4. N2F2 < N2(CH3)2