In which one of the following molecules, the central atom has expanded octet?
- Sulphur dichloridemo
Sulphuric acid
- Ozone
- Nitrogen dioxide
Boron trichloride
The Correct Option is B
Solution and Explanation
Identifying Expanded Octet
We need to find the molecule in which the central atom has an expanded octet (more than 8 electrons around it).
- Sulphur dichloride (SCl₂): Sulphur forms 2 bonds and has 2 lone pairs. Total electrons = 8. No expanded octet.
- Boron trichloride (BCl₃): Boron forms 3 bonds, total electrons = 6. Incomplete octet not expanded.
- Ozone (O₃): Central oxygen forms only 8 electrons. Oxygen cannot expand octet. No expanded octet.
- Nitrogen dioxide (NO₂): Nitrogen is in period 2 and cannot have more than 8 electrons. No expanded octet.
- Sulphuric acid (H₂SO₄): Sulphur is in period 3, forms bonds with 4 oxygens (including double bonds), allowing 12 electrons around it. This has an expanded octet.
Correct Answer: Sulphuric acid
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