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Although Sulphur contain vacant d-orbital but SF6 does not under go hydrolysis. Why ?

In SF6 Sulphur atom contain vacant d-orbital but SF6 does not undergo hydrolysis because Sulphur is sterically protected (Crowding) by six fluorine atoms and water molecules are unable to co-ordinate with vacant d-orbital of sulphur atom. Down the group in Suphur family extent of Hydrolysis increases due to increasing of size of central atoms crowding decrease. The order is as 
                                         [" SF6 < SeF6 < TeF6 "]
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