$CIF_{3 }$ exists but $FCl_{3 }$ does not because
(i) Cl has vacant ^/-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, it forms only ClF not $CIF_{3 }$.
(ii) Due to larger size, Cl can accommodate three small F atoms
around it while F being smaller cannot accommodate three bigger sized Cl atoms around it.