Which one of the following compounds of Group-14 elements is not known?

Question

Canvas Classes · Accepted Answer

Group 14 elements can expand their coordination number beyond 4 using d-orbitals (except C).

- : Well known (Si uses d-orbitals, F is small) ✓
- : Known ✓
- : Known (stannate) ✓
- : NOT known — Ge can form  but not  because Cl is too large to fit 6 around Ge. ✗

Answer: Option (1) —

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