Q50 · CSIR-NET Chemistry, December 2018

Paper: CSIR-NET December 2018 · Subject: Inorganic Chemistry · Chapter: Organometallic Compounds · Topic: Cluster Compounds Wade Rules · Marks: 2 · Difficulty: Easy

The cluster type and geometry of the species $\left[\mathrm{Rh}_{9} \mathrm{P}(\mathrm{CO})_{21}\right]^{2-}$ are
(a)closo, tricapped trigonal prism
(b)arachno, trigonal prism
(c)nido, capped square antiprism
(d)nido, bicapped trigonal prism
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
[Rh₉P(CO)₂₁]²⁻: 9×9 + 5 + 42 + 2 = 130 = 14n + 4 for n = 9 → nido, a monocapped square antiprism with the phosphide at its centre.

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