Incorrect orders of bond angle is :

Options

A. `Ocl_(2)gtSF_(2)gtAsH_(2)gtH_(2)Se`
B. `NH_(3)gtPF_(3)gtPH_(3)gtH_(2)S`
C. `XeO_(4)gtClO_(4)^(-)gtSO_(4)^(-)gtCF_(4)`
D. `N(SiH_(3))_(3)gtO(SiH_(3))_(2)gtOMe_(2)`

Explanation

To solve the question regarding the incorrect orders of bond angles, we will analyze each option step by step.

### Step 1: Analyze Option A
- **Molecules**: OCl2, SF2, ASH2, H2Se
- **Bond Angles**:
- OCl2: 110.9°
- SF2: 98.3°
- ASH2: 92.1°
- H2Se: 91°

**Order**: OCl2 > SF2 > ASH2 > H2Se
This order is correct.

### Step 2: Analyze Option B
- **Molecules**: NH3, PH3, PF3, H2S
- **Bond Angles**:
- NH3: 107.8°
- PH3: 96.3°
- PF3: 93.5°
- H2S: 92.1°

**Order**: NH3 > PH3 > PF3 > H2S
This order is also correct.

### Step 3: Analyze Option C
- **Molecules**: XeO4, ClO4^-, SO4^2-, CF4
- **Bond Angles**:
- XeO4: 109°
- ClO4^-: 109.5°
- SO4^2-: 109.5°
- CF4: 109.5°

**Order**: ClO4^- = SO4^2- = CF4 > XeO4
This order is incorrect because all the other angles are equal and higher than that of XeO4.

### Step 4: Analyze Option D
- **Molecules**: NSiH3, O-SiH3, O-CH3
- **Bond Angles**:
- NSiH3: 120°
- O-SiH3: 140°
- O-CH3: 112°

**Order**: O-SiH3 > NSiH3 > O-CH3
This order is also incorrect because the bond angles do not follow the expected trend based on molecular geometry.

### Conclusion
The incorrect orders of bond angles are found in **Option C** and **Option D**.

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