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Question

Which is not true about VSEPR theory?
  1. Lone pair-lone pair repulsion is maximum
  2. Lone pair and double bond occupy the axial position in trigonal bipyramidal structure.
  3. Bigger atoms occupy equitorial positions in trigonal bipyramidal structure.
  4. More electronegative atoms occupies the axial position in trigonal bipyramidal structure.


Solution

The correct option is B Lone pair and double bond occupy the axial position in trigonal bipyramidal structure.
According to Bent's rule, the most electronegative element occupies the hybrid orbital having a less percentage s-character or we can say that the most electronegative element occupies the axial postion. 

Large atoms, lone pairs and double bonds occupy the equitorial positions in a trigonal bipyramidal structure to minimize repulsions.

Lone pair-lone pair repulsions are always higher than lone pair-bond pair repulsions and bond pair-bond pair repulsions.

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