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  4. In BrF3 molecule, the lone pairs occupy equatorial positions to minimize

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Q. In $ Br{{F}_{3}} $ molecule, the lone pairs occupy equatorial positions to minimize

ManipalManipal 2007Chemical Bonding and Molecular Structure

Solution:

In $ Br{{F}_{3}} $ molecule, Br is $ s{{p}^{3}}d $ hybrid, but geometry is T-shaped due to distortion of geometry from trigonal-bipyramidal to T-shaped by the involvement of lone pair-lone pair repulsion. Here
$ Ip-Ip $ repulsion $ =0 $
$ Ip-bp $ repulsion $ =4 $
$ bp-bp $ repulsion $ =2 $

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