Which of the following resist hydrolysis at room temperature

Options

A. `PCI_(3),SF_(6)`
B. `C Cl_(4), NO_(2)`
C. `PCl_(5),XeF_(6)`
D. `SF_(6),C Cl_(4)`

Answer

To determine which of the given compounds resist hydrolysis at room temperature, we need to analyze the polarity of each compound. Non-polar molecules typically resist hydrolysis, while polar molecules tend to undergo hydrolysis.

### Step-by-Step Solution:

1. **Identify the Compounds**: We need to analyze the following compounds:
- PCl3
- SF6
- CCl4
- NO2
- PCl5
- XeF6

2. **Analyze PCl3**:
- Structure: PCl3 has a trigonal pyramidal shape due to the presence of a lone pair on phosphorus.
- Polarity: The dipole moments of the P-Cl bonds do not cancel out, resulting in a net dipole moment.
- Conclusion: PCl3 is polar and will undergo hydrolysis.

3. **Analyze SF6**:
- Structure: SF6 has an octahedral geometry.
- Polarity: The dipole moments of the S-F bonds cancel out completely, resulting in a net dipole moment of zero.
- Conclusion: SF6 is non-polar and will resist hydrolysis.

4. **Analyze CCl4**:
- Structure: CCl4 has a tetrahedral geometry.
- Polarity: The dipole moments of the C-Cl bonds cancel out, resulting in a net dipole moment of zero.
- Conclusion: CCl4 is non-polar and will resist hydrolysis.

5. **Analyze NO2**:
- Structure: NO2 has a bent structure due to the presence of a lone pair on nitrogen.
- Polarity: The dipole moments do not cancel out, resulting in a net dipole moment.
- Conclusion: NO2 is polar and will undergo hydrolysis.

6. **Analyze PCl5**:
- Structure: PCl5 has a trigonal bipyramidal shape.
- Polarity: The dipole moments of the axial and equatorial P-Cl bonds do not cancel out completely, resulting in a net dipole moment.
- Conclusion: PCl5 is polar and will undergo hydrolysis.

7. **Analyze XeF6**:
- Structure: XeF6 has a distorted octahedral shape due to the presence of a lone pair on xenon.
- Polarity: The dipole moments do not cancel out completely, resulting in a net dipole moment.
- Conclusion: XeF6 is polar and will undergo hydrolysis.

8. **Final Evaluation**:
- From the analysis, we find that:
- Non-polar compounds: SF6 and CCl4
- Polar compounds: PCl3, NO2, PCl5, and XeF6
- Therefore, the compounds that resist hydrolysis at room temperature are SF6 and CCl4.

### Answer:
The compounds that resist hydrolysis at room temperature are **SF6 and CCl4**.