Q83 · CSIR-NET Chemistry, December 2015

Paper: CSIR-NET December 2015 · Subject: Inorganic Chemistry · Chapter: Organometallic Compounds · Topic: Cluster Compounds Wade Rules · Marks: 2 · Difficulty: Medium

For fluxional $\mathrm{Fe}(\mathrm{CO})_{5}$ (structure given below) in solution, the exchange of numbered CO groups will be between 14

(a)2 and 5; 3 and 4

(b)2 and 3; 4 and 5

(c)2 and 3; 1 and 5

(d)1 and 2; 4 and 5

Answer

Answer: A ✓ checked by 4AB · confidence medium

Explanation

Berry pseudorotation keeps one equatorial CO as the pivot. The two axial COs swap with two equatorial ones, which pairs 2↔5 and 3↔4 (a).

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