UPSC Combined Geo-Scientist, Mains · 2023 · Mains Paper I
Q9(a). The 18-electron rule in metal carbonyls
Question
Verify whether the following metal carbonyl compounds satisfy the 18 e⁻ rule or not: (i) Fe(CO)₅ (ii) Cr(CO)₆ (iii) Mn₂(CO)₁₀ (iv) Co₂(CO)₈ (v) Ni(CO)₄
Model answer
The free solution for 2023 answers questions 1, 3, 4, 7, 8 and 10, 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 carbonylsMn2(CO)10Co2(CO)8metal-metal bond
All parts of Question 9
- 9(a) The 18-electron rule in metal carbonyls15 marks
- 9(b) Wilkinson-catalysed alkene hydrogenation10 marks
- 9(c) Preparation of Wilkinson’s catalyst5 marks