The incorrect order of bond angle :-

Options

A. `CO_(2) gt CO_(3)^(2-) gt CF_(2)Cl_(2)`
B. `NO_(2)^(+) gt NO_(3)^(-) gt NO_(2)^(-)`
C. `XeF_(2) gt XeO_(3) gt XeO_(4)`
D. `PH_(3) gt AsH_(3) gt SbH_(3)`

Answer

To determine the incorrect order of bond angles among the given compounds, we will analyze each option step by step.

### Step 1: Analyze the first option - CO2, CO3^2-, CF2Cl2
- **CO2**: This molecule has a linear structure due to its two double bonds with oxygen. The bond angle is 180°.
- **CO3^2-**: The carbonate ion has a trigonal planar structure with bond angles of 120°.
- **CF2Cl2**: This molecule has a tetrahedral geometry with bond angles of approximately 109.5°.

**Order of bond angles**: CO2 (180°) > CO3^2- (120°) > CF2Cl2 (109.5°). This order is correct.

### Step 2: Analyze the second option - NO2^+, NO3^-, NO2^-
- **NO2^+**: This ion has a linear structure due to resonance and has a bond angle of 180°.
- **NO3^-**: The nitrate ion has a trigonal planar structure with bond angles of 120°.
- **NO2^-**: The nitrite ion has a bent structure due to the presence of a lone pair on nitrogen, resulting in bond angles less than 120°.

**Order of bond angles**: NO2^+ (180°) > NO3^- (120°) > NO2^- (less than 120°). This order is also correct.

### Step 3: Analyze the third option - XeF2, XeO3, XeO4
- **XeF2**: This molecule has a linear structure due to three lone pairs on xenon, resulting in a bond angle of 180°.
- **XeO3**: This molecule has a trigonal pyramidal structure with one lone pair on xenon, resulting in bond angles less than 120°.
- **XeO4**: This molecule has a tetrahedral structure with bond angles of approximately 109.5°.

**Order of bond angles**: XeF2 (180°) > XeO4 (109.5°) > XeO3 (less than 120°). This order is incorrect as it should be XeF2 > XeO3 > XeO4.

### Step 4: Analyze the fourth option - PH3, AsH3, SbH3
- **PH3**: Phosphine has a bond angle slightly less than 109.5° due to the presence of a lone pair.
- **AsH3**: Arsenic hydride has a bond angle slightly less than that of PH3.
- **SbH3**: Stibine has an even smaller bond angle due to the larger size of antimony.

**Order of bond angles**: PH3 > AsH3 > SbH3. This order is correct.

### Conclusion
The incorrect order of bond angles is from the third option: **XeF2 > XeO3 > XeO4**.

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