The pair od species having identical shapes for molecules of both species is ? .

Options

A. `BF_(3),PCI_(3)`
B. `XeF_(2),CO_(2)`
C. `CF_(4),SIF_(4)`
D. `PF_(5),IF_(5)`

Explanation

To determine the pair of species having identical shapes for molecules of both species, we can analyze the molecular geometries of the given pairs.

### Step-by-Step Solution:

1. **Identify the Given Species**: The question provides pairs of species to analyze. The pairs are:
- A) BF3 and PCl3
- B) XCF2 and CO2
- C) CF4 and SiF4
- D) PF5 and IEF5

2. **Analyze the First Pair (BF3 and PCl3)**:
- **BF3**: Boron trifluoride has a trigonal planar shape due to the three bond pairs and no lone pairs on the boron atom.
- **PCl3**: Phosphorus trichloride has a trigonal pyramidal shape due to the three bond pairs and one lone pair on the phosphorus atom.
- **Conclusion**: Different shapes. (BF3: trigonal planar, PCl3: trigonal pyramidal)

3. **Analyze the Second Pair (XCF2 and CO2)**:
- **CO2**: Carbon dioxide has a linear shape due to two double bonds and no lone pairs on the carbon atom.
- **XCF2**: Assuming X is a halogen, XCF2 will also have a linear shape if it has two bond pairs and three lone pairs (e.g., in the case of XeF2).
- **Conclusion**: Identical shapes. (Both CO2 and XCF2 are linear)

4. **Analyze the Third Pair (CF4 and SiF4)**:
- **CF4**: Carbon tetrafluoride has a tetrahedral shape due to four bond pairs and no lone pairs on the carbon atom.
- **SiF4**: Silicon tetrafluoride also has a tetrahedral shape due to four bond pairs and no lone pairs on the silicon atom.
- **Conclusion**: Identical shapes. (Both CF4 and SiF4 are tetrahedral)

5. **Analyze the Fourth Pair (PF5 and IEF5)**:
- **PF5**: Phosphorus pentafluoride has a trigonal bipyramidal shape due to five bond pairs and no lone pairs on the phosphorus atom.
- **IEF5**: Iodine pentafluoride has a square pyramidal shape due to five bond pairs and one lone pair on the iodine atom.
- **Conclusion**: Different shapes. (PF5: trigonal bipyramidal, IEF5: square pyramidal)

### Final Conclusion:
The pairs of species having identical shapes are:
- **B) XCF2 and CO2**
- **C) CF4 and SiF4**