Give reasons for the following observations : SF_(6) is kinetically an inert substance. Or SF_(6) is inert towards hydrolysis. Or SF_(6) is much less reactive than SF_(4). Or SF_(4) is easily hydrolysed whereas SF_(6) is not easily hydrolysed.

Give reasons for the following observations : SF_(6) is kinetically a

1.	Give reasons for the following observations : SF_(6) is kinetically an inert substance. Or SF_(6) is inert towards hydrolysis. Or SF_(6) is much less reactive than SF_(4). Or SF_(4) is easily hydrolysed whereas SF_(6) is not easily hydrolysed.
Answer» Solution :In `SF_(6)`, S is sterically PROTECTED by six F atoms and hence does not ALLOW `H_(2)O` molecules to attack the S atom. Furthermore, F does not have d-orbitals to accept the electrons donated by `H_(2)O` molecules. As a result of these two RESASONS, `SF_(6)` does not undero hydrolysis. In CONSTRAST, in `SF_(4)`, S is not sterically protected since it is surrounded by only four F atoms. As a result, attack of `H_(2)O` molecules on S atom can take place easily and hence hydrolysis occurs.