According to VSEPR theory, the shapes and geometries of SeF4 and [BrF4]-, respectively, are
1
see-saw and trigonal bipyramidal; see-saw and trigonal bipyramidal
2
square planar and octahedral; square planar and pentagonal pyramidal
3
see-saw and trigonal bipyramidal; square planar and octahedral
4
square planar and square bipyramidal; square planar and octahedral