In $Br{F}_3$ molecule, the lone pair occupies equatorial position minimize

In $Br{F}_3$ 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.

Here, lp-lp repulsion =0
lp-bp repulsion =4
bp-bp repulsion =2