BCHET-147 · June 2023 · English
IGNOU BCHET-147 June 2023 Previous Year Question Paper
Organometallics, Bioinorganic Chemistry, Polynuclear Hydrocarbons And Uv-Vis, Ir Spectroscopy
Structured previous year question paper for BCHET-147, June 2023 session.
Max marks: 50 · Questions: 14
Verified: 29 Jul 2026
BACHELOR OF SCIENCE (GENERAL)
(BSCG)
Term-End Examination
June, 2023
BCHET-147 : ORGANOMETALLICS,
BIOINORGANIC CHEMISTRY, POLYNUCLEAR
HYDROCARBONS AND UV-VIS, IR
SPECTROSCOPY
Time : 2 Hours Maximum Marks : 50
Note :
(i) Attempt any five questions from Part A
and any five questions from Part B on
separate answer sheets.
(ii) All questions carry equal marks.
Part—A
Q1.(a) What is the IUPAC name for potassium ferricyanide ? 1
(b) How is sodium nitroprusside useful as a lab reagent ? Give suitable reactions. 4 [ 2 ]
Q2.Explain the classification of non -classically bonded organometallic compounds with suitable examples.
Q3.Draw the structure of Fe(CO) 5. Explain how would you arrive at its shape on the basis of valence bond approach.
Q4.The carbonyl complex with a linear OC –M–CO group is undergoing the following changes :
(i) One CO replaced by triethyl amine
(ii) The neutral complex changes to a positively charged complex.
(iii) The ne utral complex is converted to a negatively charged complex. Then how does its CO stretching frequency change ? Give reasons.
Q5.Give an account of the toxicity of mercury.
Q6.Why the channels for sodium ion transpo rt are permeable to hydrogen ions, but potassium ion channels are not ? 5 [ 3 ]
Q7.(a) Give any three differences between hemoglobin and myoglobin. 3
(b) Briefly explain the Bohr effect in the context of oxygenation of hemoglobin. 2 Part—B
Q8.(a) Write the chemical equation for the reaction of cyclohexanone with ethyl 3-oxobutanoate in presence of NaOC 2H5 in ethanol as solvent. What is the name of this reaction ? 2½
(b) Write the Keto -enol equilibrium for ethyl 3-oxobutanoate. Which form is more stable ? 2½
Q9.(a) Complete the following reactions : 3 355K 24+ H SO
(iii) 25Na, C H OH reflux
(b) What are effects of polycyclic aromatic hydrocarbons on human health ?
Q10.Explain why the attack of electrophile in pyrrole usually takes place at C -2 position and not C-3 position.
Q11.(a) Explain the terms hypsochromic shift and hypochromic shift. 2
(b) Giving suitable examples , explain the terms chromophore and auxochrome.
Q12.Explain the solvent effects on electronic spectra.
Q13.Diagrammatically explain the normal modes of vibrations of a triatomic angular molecule, AB 2. Calculate the number of vibrational degrees of freedom for NH3 molecule.
Q14.(a) Which of the following will have lower value for C = O absorption in IR spectrum and why ? 2 2 butanone or 3-butene-2-one
(b) Arrange the following in the increasing order of their carbonyl stretching absorption frequencies in IR spectrum and give reason in support of your answer : Cyclopentanone, Cyclopropanone, Cyclohexanone. 3 2023 -147 Fe(CO)5 OC–M–CO
(iii) NaOC2H5 355K 24+ H SO
(iii) 25Na, C H OH C = O BCHET–147 4,0
(10)