Concept:The shape of a molecule is determined by the arrangement of electron pairs around the central atom using VSEPR theory.
Explanation:Bromine pentafluoride has the formula
BrF5​.
The central bromine atom has 7 valence electrons.
Five fluorine atoms form five bonding pairs with bromine.
The remaining one electron pair stays as a lone pair on bromine.
Thus, there are 6 electron pairs around the central atom.
These 6 pairs are arranged octahedrally to minimise repulsion.
With 5 bonding pairs and 1 lone pair, the lone pair occupies an equatorial position.
Hence, the molecular shape becomes square pyramidal.
Answer:B. Square pyramidal
