IGNOU BCHET-147 Solved Assignment 2026 (January & July 2026) – BSCG – English Medium PDF

📌 Programme: BSCG (B.Sc. General) · Course: BCHET-147 — Organometallics, Bioinorganic Chemistry, Polynuclear Hydrocarbons and UV, IR Spectroscopy · Session: January 2026 & July 2026 · Last date: 30 Apr 2026 (Jan 2026) / 31 Oct 2026 (Jul 2026), as per IGNOU portal.

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IGNOU BCHET-147 assignment (January 2026 & July 2026) ke ye sawaal is PDF mein solved hain:

1. Q1. What is the chromyl chloride test? Give suitable equations. 5 marks
2. Q2. Give the structure of dimethyl beryllium. 5 marks
3. Q3. Explain the concept of hapticity with reference to allyl complexes , such as [Pd(η3-C3H5)Cl]. How does η3-coordination differ from η¹-coordination in terms of bonding and structure? 5 marks
4. Q4. Explain the structure of Fe 2(CO)9 based on valence bond approach. 5 marks
5. Q5. How can formation of nitrosyl complexes be formed from carbonyl complexes with the help of nitric oxide? Give three suitable equations to show this. 5 marks
6. Q6. The C–O stretching frequencies in the IR spectra of certain metal carbonyl species are as follows: Ni(CO)4: 2056 cm⁻¹; [Fe(CO)6]²⁺: 2200 cm⁻¹. The value for CO(g) is 2143 cm⁻¹. Discuss. 5 marks
7. Q7. What information is obtained from the IR spectrum of Fe2(Cp)2(CO)4 (given in the official PDF: terminal C–O bands near 2000 cm⁻¹ and a bridging C–O band near 1800 cm⁻¹ for the structure with two terminal and two bridging CO ligands)? 5 marks
8. Q8. Which metal ion is essential for the process of blood coagulation? Explain the mechanism by which it facilitates clot formation? Give the different ways by which cadmium affects the human body. 5 marks
9. Q9. With the help of a suitable diagram explain the Na +-K+ pump. Show how the sodium- potassium pump moves toward an equilibrium state with the relative concentrations. 5 marks
10. Q10. With the help of a suitable diagram, explain the mechanism of oxygen binding in hemoglobin and discuss the structural changes that occur upon formation of oxyhemoglobin. 5 marks
11. Q11. How will you prepare 5-hexen-2-one from ethyl 3-oxobutanoate. Give the reactions involved and the reagents used in the reaction. 5 marks
12. Q12. (a) Give IUPAC names of the following compounds: (i) naphthalene with Cl at C-1 and C-4 and Br at C-2; (ii) naphthalene with Cl at C-1, Br at C-2 and NO2 at C-4.
    (b) Is naphthalene an aromatic compound? Explain. 5 marks
13. Q13. Give the reaction involved and the reagents used for the commercial preparation of pyrrole. 5 marks
14. Q14. Give the resonance structures for the intermediate in the reaction where electrophile E+ attacks on 2-position of pyridine. 5 marks
15. Q15. What are the differences between Bathochromic shift and Hypsochromic shift? 5 marks
16. Q16. Explain Woodward rules for predicting π-π* absorption in dienes. 5 marks
17. Q17. What sort of shift may be observed in bromobenzene, (C 6H5Br)? 5 marks
18. Q18. Explain the Feiser and Scott rules for predicting π − π* absorption in α, β-unsaturated ketones (enones) and aldehydes. 5 marks
19. Q19. With the help of suitable diagrams explain how the IR spectrum is depicted in the absorption mode and the transmittance mode. 5 marks
20. Q20. The IR spectrum of a sample of cyclohexanol is recorded. Which major absorption bands you would be looking for in the spectrum? 5 marks

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