1.

Give reason to explain why CIF_(3) exists but FCl_(3) does not exist.

Answer»

Solution :Reasons are : (i) Cl has vacant d-orbitals and hence can show an oxidation STATE of +3 but F has no d-orbitals, therefore, it cannot show positive oxidation states. Further, since F can show only -1 oxidation state, therefore, itcan FORM only ClF and not `FCl_(3)`.
(ii) Because of BIGGER size, Cl can ACCOMMODATE three small F atoms around it while F being smaller cannot accommodate three bigger sized Cl atoms around it.


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