BCHET-147 EM 2025 SOLVED ASSIGNMENT

Description

Tutor Marked Assignment
BCHET-147: ORGANOMETALLICS, BIOINORGANIC CHEMISTRY, POLYNUCLEAR
HYDROCARBONS AND UV, IR SPECTROSCOPY
Course Code: BCHET-147
Assignment Code: BCHET-147/TMA/2025
Maximum Marks: 100
Note: Attempt all questions. The marks for each question are indicated against it.
PART A: ORGANOMETALLICS, BIOINORGANIC CHEMISTRY
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Give the IUPAC nomenclature of potassium dichromate. Also give its reaction with
potassium iodide in acidic medium.
Give the structure of methyl lethium.
With the help of suitable equations, give any two methods for preparation of metal
carbonyls by reductive carbonylation.
Explain the structure of Fe(CO)5 based on valence bond approach.
With suitable reactions (any two) explain how carbonyl hydrides are formed by
reaction of metal carbonyls with hydrogen.
With suitable diagrams explain the polarity of the free CO molecule as well as when
it binds with a transition metal cation.
What information is obtained from the IR spectrum of Fe2(CO)9?
The IR spectrum of Fe2(CO)9
Give a short account of the essential and non essential elements occurring in
biological systems.
Give the different ways by which lead affects the human body.
Explain the conversion of heme to hemin along with a suitable diagram.
PART B: POLYNUCLEAR HYDROCARBONS AND UV, IR SPECTROSCOPY
How will you prepare pentan-2-one from ethyl 3-oxobutanoate. Give the reactions
involved.
(a) Give IUPAC name the following compounds.
(5)
(5)
(5)
(5)
(5)
(5)
(5)
(5)
(5)
(5)
(5)
(2)
3
OH
C
NH
NO
2
H
3
2
Cl
CH
3
(b) Is anthracene aromatic compound? Explain.
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(a) Among pyridine and pyrrole which one is more basic? Explain
In pyridine substitution occur which at the 3 position. Explain.
Which are the two main parameters on which the absorption bands in ultraviolet and
visible spectra are measured?
Explain Woodward rules for predicting -* absorption in dienes.
Explain with the help of a diagram the orbital energy relationship between isolated
and conjugated C=C and C=O groups.
For polyatomic molecule, what are the different types of normal modes of vibration?
Give the normal modes of vibrations for the symmetric stretching of a triatomic linear
and triatomic angular molecule with suitable diagrams.
Give the characteristic frequencies of the ketones and aldehydes. How are they different from
esters?
(a) List the factors affecting the position and intensity of IR bonds in the IR spectrum.
(b) Explain the bands appearing in the IR spectrum of an alkane giving a suitable example.