Order of number of planes present in molecule which contains maximum number of atoms of correoponding molecule :

Options

A. `IF_(7) gt SF_(6) gt CH_(4)`
B. `CH_(4) gt SF_(6) gt IF_(7)`
C. `SF_(6) gt IF_(7) gt CH_(4)`
D. `CH_(4) gt IF_(7) gt SF_(6)`

Explanation

To solve the problem of determining the order of the number of planes present in the molecules IF7, SF6, and CH4, we need to analyze the molecular geometry of each compound and count the number of distinct planes formed by the atoms in each molecule.

### Step-by-Step Solution:

1. **Identify the Molecular Geometry:**
- **IF7 (Iodine Heptafluoride):**
- The molecular geometry is pentagonal bipyramidal.
- In this structure, there are 5 fluorine atoms in a plane (the equatorial plane) and 2 fluorine atoms above and below this plane (the axial positions).

2. **Count the Number of Planes in IF7:**
- The pentagonal bipyramidal structure has:
- 1 equatorial plane (where 5 fluorine atoms lie).
- 1 axial plane (which can be considered as the plane that includes the two axial fluorine atoms).
- Total planes = 1 (equatorial) + 1 (axial) = **1 distinct plane**.

3. **Analyze SF6 (Sulfur Hexafluoride):**
- The molecular geometry is octahedral.
- In this structure, there are 6 fluorine atoms arranged around the sulfur atom.

4. **Count the Number of Planes in SF6:**
- The octahedral structure has:
- 3 distinct planes: one horizontal plane (equatorial) containing 4 fluorine atoms, and two vertical planes (axial) that contain the remaining 2 fluorine atoms.
- Total planes = 3 distinct planes.

5. **Examine CH4 (Methane):**
- The molecular geometry is tetrahedral.
- In this structure, there are 4 hydrogen atoms arranged around the central carbon atom.

6. **Count the Number of Planes in CH4:**
- The tetrahedral structure has:
- 6 distinct planes formed by the combinations of the hydrogen atoms.
- Total planes = 6 distinct planes.

7. **Order the Molecules by Number of Planes:**
- IF7: 1 plane
- SF6: 3 planes
- CH4: 6 planes

8. **Final Order:**
- The order of the number of planes from maximum to minimum is:
- CH4 > SF6 > IF7.

### Final Answer:
The order of the number of planes present in the molecules is:
**CH4 > SF6 > IF7**