Answer:
Chlorine has vacant 3d-orbitals and
an electron can be promoted from 3p filled orbital to 3d orbital. Thus,
chlorine can show a covalency of 3 in its compounds and a molecule of \[Cl{{F}_{3}}\]
can exist. But fluorine has no vacant Id orbitals and can exhibit only
covalency of one in its compounds. Thus, a molecule of \[FC{{l}_{3}}\] fails to exist.
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