Question:
In which of the following compounds there is an expanded octet around the central atom?
In which of the following compounds there is an expanded octet around the central atom?
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Only elements from period 3 onwards (like \(P, S, Cl\)) can show expanded octet due to vacant d-orbitals.
Updated On: Apr 24, 2026
- \(SCl_2\)
- \(NO_2\)
- \(NH_3\)
- \(PCl_3\)
- \(H_2SO_4\)
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The Correct Option is
Solution and Explanation
Concept:
Expanded octet occurs when the central atom has more than 8 electrons in its valence shell.
This is possible for elements in period 3 or beyond due to availability of d-orbitals.
Step 1: Analyze each compound.
• \(SCl_2\): Sulfur has 8 electrons $\rightarrow$ no expansion
• \(NO_2\): Nitrogen cannot expand octet
• \(NH_3\): Nitrogen follows octet
• \(PCl_3\): Phosphorus has 8 electrons
• \(H_2SO_4\): Sulfur has more than 8 electrons (expanded octet)
Step 2: Select correct compound.
Only \(H_2SO_4\) shows expanded octet.
Step 1: Analyze each compound.
• \(SCl_2\): Sulfur has 8 electrons $\rightarrow$ no expansion
• \(NO_2\): Nitrogen cannot expand octet
• \(NH_3\): Nitrogen follows octet
• \(PCl_3\): Phosphorus has 8 electrons
• \(H_2SO_4\): Sulfur has more than 8 electrons (expanded octet)
Step 2: Select correct compound.
Only \(H_2SO_4\) shows expanded octet.
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