Explain the shape of BrF5. - Vidyadip

Question

Explain the shape of BrF₅.

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Answer

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, sp³d²hybridisation 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.

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