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Question

Which is not true about VSEPR theory?

A
Lone pair-lone pair repulsion is maximum
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B
Lone pair and double bond occupy the axial position in trigonal bipyramidal structure.
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C
More electronegative atoms occupies the axial position in trigonal bipyramidal structure.
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D
Bigger atoms occupy equatorial positions in trigonal bipyramidal structure.
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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 occupy 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 occupies equatorial 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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