Which of the following molecules have $\mathrm{dsp}^{2}$ hybridisation?
(i) $[Ni(CN)_4]^{2-}$
(ii) $BrF_5$
(iii) $[Co(NH_3)_6]^{3+}$
(iv) $[CrF_6]^{3-}$
(v) $[PtCl_4]^{2-}$
Show Hint
\(dsp^2\) uses inner d-orbitals (3d for first transition series) and is found in square planar complexes with strong field ligands like CN\(^-\), CO, PR\(_3\).