Number of molecules from the following which are exceptions to the octet rule is

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Canvas Classes · Accepted Answer

Octet rule exceptions fall into three categories: electron-deficient, odd-electron, and expanded octet.

Step 1 — Electron deficient (fewer than 8e⁻ on central atom):
- : B has 6e⁻ ✓ exception
- : Be has 4e⁻ ✓ exception

Step 2 — Odd-electron molecules:
- : 17 valence electrons → odd ✓ exception
- : 19 valence electrons → odd ✓ exception

Step 3 — Expanded octet (more than 8e⁻ on central atom):
- : S has 12e⁻ ✓ exception
- : P has 10e⁻ ✓ exception
- : Si has exactly 8e⁻ — obeys octet ✗

Step 4 —

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