Which of the following compounds/species have undistorted octahedral structure?

$SF_{6}$

$PF_{6 ⊖}$

$SiF_{6}$

$XeF_{6}$

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UP LT Grade Teacher (Science) 2018 Official Paper

Answer 1

CONCEPT:

Undistorted Octahedral Structure

Octahedral geometry is observed when a central atom is surrounded by six ligands arranged symmetrically around it at 90-degree bond angles.
An undistorted octahedral structure occurs if the central atom has no lone pairs and the bonding is not affected by steric or electronic factors.

EXPLANATION:

SF₆:
- Sulfur is the central atom, surrounded by six fluorine atoms.
- Sulfur has no lone pairs, and the geometry is perfectly octahedral.
PF₆^⊖:
- Phosphorus is the central atom, surrounded by six fluorine atoms.
- Phosphorus has no lone pairs, and the geometry is undistorted octahedral.
SiF₆:
- Silicon is the central atom, surrounded by six fluorine atoms.
- Silicon has no lone pairs, and the structure is undistorted octahedral.
XeF₆:
- Xenon is the central atom, surrounded by six fluorine atoms.
- Xenon has one lone pair, which causes distortion in the geometry, making it a distorted octahedral structure.

CONCLUSION:

The compounds/species with undistorted octahedral structures are SF₆, PF₆^⊖, and SiF₆.
XeF₆ is excluded due to the distortion caused by the lone pair.

Correct Answer: Option 1 (2, 3, and 4)

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