clf3 exist but fcl3 does not , why?
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Flourine doesnot possess d orbitals, so it cannot expand its octet to bond with three chlorine atoms and form FCl3. Chlorine on the other hand has empty d orbitals and thus it can expand its octet to bond with three flourine atoms and form ClF3.
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In case of Clf3 due to presence of Vacant d orbital in cl atom promotion of electron tales place from 3s to 3d giving higher +ve oxidation state.So Clf3 exist.
But in case of fcl3 due to the absence of d orbital in f atom promotion of electron doesn't take place and doesn't give higher +ve oxidation state.So fcl3 doesn't exist.
Jay Hind
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