IGNOU MCHE 13 SOLVED ASSIGNMENT

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MCHE 013 (July 2025 - January 2026) - ENGLISH

Course Code: MCHE-013

Assignment Code: MCHE-013/TMA/2025-26

Maximum Marks: 100

Note: Attempt all questions. The marks for each question are indicated against it.

1.

a) Explain cation- interactions in supramolecular chemistry with a suitable example.

(5)

b) What are van der Waals interactions? What is its role in supramolecular chemistry?

(5)

2.a) Explain the different types of cooperativity in supramolecular chemistry. Also give suitable examples (one each) for each type.

b) "A kinetically stable supramolecular complex may not always be the thermodynamically most stable product". Justify this statement.

3.a)Discuss the important factors which may be considered when one designs a molecular receptor for selective binding of a guest molecule.

b) In what ways does preorganization reduce the entropic penalty during binding?

4.a) What is spherical recognition? Which type of species exhibit such a recognition? Name three classes of hosts involved in such recognition.

b) What are spherands? Give their characteristics. Also draw the structure of a spherand.

5.a) What is bis(tren)? Draw its structure and the structure of its smaller analogue. Discuss important features of its bonding with different anions.

b) What are cyclodextrins? Name three important cyclodextrins. Also give their constituent units and the type of bonds present in them.

6a)Write the structures of the following compounds

i)15-crown-5

ii) 18-crown-6

b) Which cations will fit into these crown ethers?

(2) 

c) Explain entropic hydrophobic effect. What is its role in supramolecular chemistry?

7.a) "Supramolecualar systems have been designed to mimic the structure or function of more complex biological processes". Explain this with any two examples.

b) Explain the supramolecular features of plant photosynthesis.

8.a) What are the steps involved in supramolecular reactivity and catalysis?

MCHE 013 (July 2026 - January 2027) - ENGLISH

Tutor Marked Assignment
MCHE-013: SUPRAMOLECULAR CHEMISTRY
Course Code: MCHE-013
 Assignment Code: MCHE-013/TMA/2026-27
Maximum Marks: 100
Note: Attempt all questions. The marks for each question are indicated against it.
1. a) Explain dipole-dipole interactions in supramolecular chemistry with a suitable example.
What is its energy range and why are they important? When are they helpful in molecular
recognition?
(5)
 b) Explain the lock and key principle of binding in supramolecular chemistry with suitable
diagrams.
(5)
2. a) What are the different types of supramolecular complexes? Illustrate your answer. (5)
 b) Give the differences between enthalpy-driven and entropy-driven binding processes. (5)
3. a) Distinguish between clatharate and clathrand? What are cucurbiturils? Draw any one
cucurbituril.
(5)
 b) What are calixarenes? Draw the diagram for binding of sodium ion as guest to the
oxygen of methyl ether groups of the calixarene and label the hydrophobic part in it.
(5)
4. a) Draw the diagrams for Soccer ball” cryptand molecule which acts as a cation host for
+ NH4
ion as well as the diprotonated form acting as a host for H2O molecule. What
makes the soccer ball crypates good hosts for anions?
(5)
 b) Give any two suitable examples of two-dimensional hosts. Give examples of Zwiterionic hosts
and amide based hosts. Which type of hosts can accommodate dicarboxylate anion guests?
(5)
5. a) What are the types of interactions that take place when hosts bind with guests? Why are
neutral receptors accommodated by hosts?
(5)
 b) Give the structure of the trimesic acid assembly. Which polyhalogen ions can this network
accommodate? What sort of conformation of cyclotriveratrylene helps in forming inclusion
compounds in solid state with benzene, toluene etc. Give suitable diagrams.
(5)
6 a) With the help of a suitable diagram explain the minimal self-replication model which is the key
to life.
(5)
 b) Discuss the mechanism of self-assembly in the Tobacco Mosaic Virus. What are the main noncovalent ineractions that dominate biological self-assembly? Why self-assembly is essential in
biology?
(5)
7. a) What are the advantageous of having synthetic models of biological systems? Differentiate
between a structural mimic and a functional mimic.
(5)
 b) Describe the three fundamental steps involved in natural and artificial photosynthesis. In what
way supramolecular chemistry helps in designing artificial photosynthetic systems?
(5)
8. a) Differentiate between catalysis and cocatalysis in supramolecular chemistry. With the help of a
suitable diagram give the schematic illustration of the cocatalysis process.
(5)
 b) What are the essential characteristics of an effective carrier in supramolecular transport? What is
electron-cation symport, and how is it achieved in supramolecular transport systems?
(5)
9. a) With the help of suitable diagrams give the differences between the structures of racks, ladders
and grids. 

 

b) What are metal-organic frameworks (MOFs)? What are other names of the organic ligands in
them. Give examples of any two such frameworks.
(5)
10. a) With the help of suitable diagrams explain the synthesis of caternanes and rotaxanes via hostguest chemistry.
(5)
 b) What is supramolecular isomerism, and how does it relate to polymorphism? Explain the concept
of rational design in supramolecular chemistry. 

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Course Name	M.Sc. in Chemistry
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