Indian Forest Service (Mains), Chemistry optional · 2024 · Paper I
Q7(a). Why CO and N₂ differ as ligands
Question
N₂ and CO are isoelectronic but their molecular orbitals differ. Draw the MOs of both, and state with reasons the differences and their coordinating ability.
Model answer
The free solution for 2024 answers questions 1, 2, 4, 5 and 8, the ones picked in its time plan. Question 7 is answered in full in the IFoS Chemistry Paper I, 2021 to 2025 book, with every part of every paper.
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UPSC Indian Forest Service (Main) Chemistry Paper I: Model Answers 2021 to 2025
- All eight questions of each paper, with the question printed above its answer
- Physical chemistry numericals worked with units; inorganic structures drawn
- Topic-wise weightage and a topic-wise index
Coversmolecular orbital diagramCO vs N2π-backbondingσ-donor π-acceptor ligandisoelectronic molecules
All parts of Question 7
- 7(a) Why CO and N₂ differ as ligands15 marks
- 7(b)(i) Hydrogen addition to Vaska complex5 marks
- 7(b)(ii) Fluxionality of tetracyclopentadienyltitanium10 marks
- 7(c) Divalent europium and samarium10 marks