Discussion
Which of the following molecules have dsp2 hybridisation?
(i) \([Ni(CN)_{4}]^{2-}\) (ii) \(BrF_{5}\) (iii)\([Co(NH_{3})_{6}]^{3+}\) (iv) \([CrF_{6}]^{3-}\) (v) \([Pt(Cl)_{4}]^{2-}\)
Answer: D
The dsp2 species are (i) and (v).
\([Ni(CN)_{4}]^{2-}\) and \([PtCl_{4}]^{2-}\) are square planar d8 complexes: strong-field CN−, and the large crystal-field splitting of a 5d metal for Pt, pair the d electrons and free one inner d orbital, giving dsp2 hybridisation.
The others are not dsp2: BrF5 is square pyramidal (sp3d2), \([Co(NH_{3})_{6}]^{3+}\) is octahedral (d2sp3), and \([CrF_{6}]^{3-}\) is octahedral (d2sp3).
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