Q9(a). Electron counts and metal-metal bonds
Determine the total valency electrons of metal and number of metal-metal bonds present in the following compounds, which obey the 18-electron rule. Draw structures. (i) Co₂(CO)₈: (CO)₃Co(μ-CO)₂Co(CO)₃ (ii) (η⁵-C₅H₅)(CO)Fe(μ-CO)₂Fe(CO)(η⁵-C₅H₅)
Model answer
The free solution for 2022 answers questions 1, 2, 4, 7, 8 and 11, the ones picked in its time plan. Question 9 is answered in full in the Geo-Scientist Chemistry Paper I, 2021 to 2025 book, with every part of every paper.
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UPSC Combined Geo-Scientist (Main) Chemistry Paper I: Model Answers 2021 to 2025
- All eleven questions of each paper, with the question printed above its answer
- Titration, gravimetric and nuclear numericals worked with units; structures drawn
- Topic-wise weightage and a topic-wise index
Covers18-electron rulemetal-metal bondCo2(CO)8[CpFe(CO)2]2bridging carbonyl
All parts of Question 9
- 9(a) Electron counts and metal-metal bonds10 marks
- 9(b) Structures and bonding of iron carbonyl clusters15 marks
- 9(c) Substitution in vanadium carbonyls5 marks