Q68 · CSIR-NET Chemistry, December 2014

Paper: CSIR-NET December 2014 · Subject: Inorganic Chemistry · Chapter: Organometallic Compounds · Topic: Organometallic Compounds – General · Marks: 2 · Difficulty: Easy

$\mathrm{Co}_{4}(\mathrm{CO})_{12}$ adopts the
(a)closo-structure
(b)nido-structure
(c)arachno-structure
(d)hypho-structure
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
Each Co(CO)₃ unit gives 9 + 6 − 12 = 3 skeletal electrons, so 4 × 3 = 12 = 6 pairs = n + 2 for n = 4. A nido structure (tetrahedron = trigonal bipyramid minus one vertex) (b).

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