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Question

The number of electron pairs in OSF4 is
  1. 4

  2. 5

  3. 5.5

  4. 6


Solution

The correct option is B

5


 As we already know, we will not apply VSEPR theory here, because according to VSEPR Theory,

ep = (6+5)2 = 112 

Now, we will apply AVSEPR Theory.

Central atom will be S [Because of the presence of d-orbitals] and In VSEPR Theory, we ignore oxygen.

Therefore, number of Ligands = 4 [only Fluorine's ignoring oxygen]

Valence electrons in S = 6

Therefore, number of electron pairs =  (6+4+00)2 = 5

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