Amongst the species given below which have shape similar to `XeOF_4`.
(I) `XeO_3`
(II) `IF_5`
(III) `PCI_5`
(IV) `SF_4`.

Options

A. Only II
B. Only I
C. II and III
D. II and IV

Answer

To determine which of the given species has a shape similar to `XeOF_4`, we need to analyze the molecular geometry of `XeOF_4` and compare it with the other species listed.

### Step-by-Step Solution:

1. **Determine the Structure of `XeOF_4`:**
- Xenon (Xe) is the central atom.
- It has 8 valence electrons (being a noble gas).
- It forms 4 single bonds with fluorine atoms and 1 double bond with an oxygen atom. This results in 4 sigma bonds and 1 lone pair of electrons.

2. **Calculate the Steric Number:**
- The steric number is calculated as the sum of sigma bonds and lone pairs.
- For `XeOF_4`:
- 4 sigma bonds (from 4 `Xe-F` bonds) + 1 lone pair = 5.
- Therefore, the steric number is 5.

3. **Determine Hybridization:**
- A steric number of 5 corresponds to `sp^3d` hybridization.

4. **Identify the Geometry:**
- The geometry for `sp^3d` hybridization is trigonal bipyramidal.
- However, with 1 lone pair, the shape becomes square pyramidal.

5. **Check the Other Species:**
- **(I) `XeO_3`:**
- Steric number = 3 sigma bonds + 1 lone pair = 4 (hybridization `sp^3`, shape is trigonal pyramidal).
- **(II) `IF_5`:**
- Steric number = 5 sigma bonds + 1 lone pair = 6 (hybridization `sp^3d^2`, shape is square pyramidal).
- **(III) `PCl_5`:**
- Steric number = 5 sigma bonds = 5 (hybridization `sp^3d`, shape is trigonal bipyramidal).
- **(IV) `SF_4`:**
- Steric number = 4 sigma bonds + 1 lone pair = 5 (hybridization `sp^3d`, shape is see-saw).

6. **Conclusion:**
- The only species that has a shape similar to `XeOF_4` (which is square pyramidal) is `IF_5`.

### Final Answer:
The species that has a shape similar to `XeOF_4` is **(II) `IF_5`**.

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