Square pyramidal structures are ${\mathrm{BrF}}_5,{\mathrm{IF}}_5$ and ${\mathrm{ClF}}_5$.

These molecules are made up of 6 equally spaced ${\mathrm{sp}}^3{\mathrm{d}}^2$ hybrid orbitals arranged at ${90}^{\mathrm{o}}$ angles. The shape of the orbitals is octahedral. One orbital contains a lone pair of electrons, so the remaining five atoms connected to the central atom gives the molecule a square pyramidal shape. Among the given options the structure with five bond pairs and one lone pair is these three structures only.