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This may be because of the reversed polarity (of CCl4) i.e. a positive halogen. The element sulfur should be able to form S(CH3)6 (theoretically feasible) and F3S≡C-SF3 (observed). These compounds contain sulfur in the formal oxidation state of +6. So, Chlorine should form at least Cl(CH3)3 or even Cl(CF3)5.

It may be an overestimated electronegativity for chlorine (and for heavier halogens). The real electronegativity descending order may be Ne > F~O > N > C~Ar~He > Kr > Cl > Br > S > ....

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13y ago

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