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Question
Why is SF6 is not hydrolysed by water ,whereas SF4 can be hydrolysed ? Give reason?
Why is SF6 is not hydrolysed by water ,whereas SF4 can be hydrolysed ? Give reason?
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Solution
SF6 is not hydrolysed by water whereas SF4 can be hydrolysed because
a) Steric hindrance: The six F-atoms in SF6 surrounds the central S-atom, making it difficult to be attacked by water molecule.
b) High bond strength of S-F: Due to highly symmetrical structure (octahedral), all the bonds are of equal length and strength. This makes them difficult to get hydrolysed.
c) Coordinative saturation: The central S-atom is saturated in terms of coordination. Hence less reactive towards hydrolysis.
Whereas SF4 is easily hydrolysed by water:
SF4 + 2H2O SO2 + 4HF
a) Steric hindrance: The six F-atoms in SF6 surrounds the central S-atom, making it difficult to be attacked by water molecule.
b) High bond strength of S-F: Due to highly symmetrical structure (octahedral), all the bonds are of equal length and strength. This makes them difficult to get hydrolysed.
c) Coordinative saturation: The central S-atom is saturated in terms of coordination. Hence less reactive towards hydrolysis.
Whereas SF4 is easily hydrolysed by water:
SF4 + 2H2O SO2 + 4HF
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