The
maximum
coordination number of sulphur is 6. Hence S cannot accommodate more than 12 electrons around
it. SF6 is covalently
saturated compound. Thus six fluorine atoms around sulphur protect sulphur from
attack by reagent to such an extent that even thermodynamically favorable
reaction like hydrolysis (S-O bond is
stronger than S-F bond) does not occur. On the other hand, in SF4, the coordination number is only four. Hence
sulphur can be attacked by H2O.
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