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Give reason to explain why ClF_{3} exists but FCl_{3}  does not exist.

 

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Though both Cl \; and \; F are halogens,F has a configuration 2s^{2}2p^{5} and doesn’t have a d-orbital. Chlorine on the other hand can undergo sp^{3}d-hybridisation, where three orbitals will have unpaired electrons as shown below. Three fluorine atoms with a single unpaired electron each can pair up with the sp^{3}d-hybridised chlorine atom.

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