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IGNOU MCHE-13 (July 2025 – June 2026) Assignment Questions
1. a) Explain cation– π interactions in supramolecular chemistry with a suitable example.
b) What are van der Waals interactions? What is its role in supramolecular chemistry?
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.
6 a) Write the structures of the following compounds
i) 15-crown-5
ii) 18-crown-6
b) Which cations will fit into these crown ethers?
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?
b) What are rotaxanes? Give a suitable diagram for it.
9. a) Elaborate on self-assembling coordination compounds with any one example.
b) What are tectons in supramolecular chemistry? How the concept of supramolecular synthon developed from this?
10. a) Explain the supramolecular electronic ionic and switching devices with a suitable example.
b) When is device supramoelcular?
