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

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Q. In $BrF_3$ molecule, the lone pairs occupy equatorial positions to minimise

AIPMTAIPMT 2004Chemical Bonding and Molecular Structure

Solution:

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