Question

SF6 is not easily hydrolysed whereas SF4 is easily hydrolysed...why...???

Answer 1

Due to steric reasons SF6 is exceptionally stable & thus hinders the attack of water molecules.

Answer 2

As $SF_4$ is less stable than $SF_6$, it undergoes hydrolysis.

• When the structure of $SF_4$ and S$F_6$ are examined, it gives an idea about the stability of the compound.

• In the case of $SF_4$, the central atom sulfur is attached with 4 Fluorine atoms and it contains lone pair of an electron which are not involved in the bond formation.

• In the case of  S$F_6$, the central atom sulfur is attached with 6 fluorine atoms and has no lone pairs left to bond.

• Due to the presence of lone pair of an electron in $SF_4$, it undergoes hydrolysis, whereas due to absence of lone pairs of an electron in S$F_6$, it cannot be hydrolyzed.

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