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Both C CI4 and SiCI4 has stable octets o...

Both `C CI_4` and `SiCI_4` has stable octets of the central atoms, but `SiCl_4`, is acidic. Why?

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`C CI_4` is saturated. The central atom carbon has no vacant d-orbitals in its valence shell. `SiCl_4` is a Lewis acid. The central atom silicon has empty d-orbitals in the valency shell and excitation is easy. It acts as Lewis acid, by expanding its octet configuration.
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