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CIF3 exists but FCl3 does not exist. Why...

`CIF_3` exists but `FCl_3` does not exist. Why?

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As `Cl` has vacant d-orbital in its valence shell `Cl` can expand its coordination number.

to `3` and shows an oxidation state of `+3` and `ClF_(3)` exists. Whereas, `F` due to absence of d-orbital in its valence shell can have coordination number 1 only. Hence , `FCl_(3)` does not exist.
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