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B
Four fluorine atoms and Br atom is in same plane.
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C
Four fluorine atoms are in same plane.
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D
It has all F−Br−F bond angles at 90∘.
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Solution
The correct option is C Four fluorine atoms are in same plane.
Br-atom has configuration:
1s2,2s22p6,3s23p63d10,4s24p5
To get pentavalency, two of the p-orbitals are unpaired and electrons are shifted to 4d-orbitals. In this excited state, sp3d2-hybridisation occurs giving octahedral structure. Five positions are occupied by F atoms forming sigma bonds with hybrid bonds and one position occupied by lone pair, i.e., the molecule as a square pyramidal shape.
So, from the square pyramidal structure of BrF5 as shown above, four fluorine atoms are present in the same plane. However, the Bromine, central atom lies slightly below the square planer.