Chemistry Class 12 NCERT Solutions: Chapter 15 Polymers Part 3 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Q: 7. Write the names and structures of the monomers of the following polymers:

(i) Buna-S

(ii) Buna-N

(iii) Dacron

(iv) Neoprene


Q_7_Table of NAmes and Structures of the Monomers and Polymers
PolymerMonomerStructure of Monomer
ivDacronEthylene glycol
Terephthalic acid
Q_7_iv_Structure of Monomers

Q: 18. Identify the monomer in the following polymeric structures.



Q_18_ii_Structure of Polymeric

(i) The monomers of the given polymeric structure are decanoic acid and hexamethylene diamine

(ii) The monomers of the given polymeric structure are

Q_18_ii_Ans_Structure of Polymeric

Q: 19. How is dacron obtained from ethylene glycol and terephthalic acid?


The condensation polymerisation of ethylene glycol and terephthalic acid leads to the formation of dacron.

Q_19_Structure of Dacron, Ethylene Glycol and Terephthalic a …

Q: 20. What is a biodegradable polymer? Give an example of a biodegradable aliphatic polyester.


A polymer that can be decomposed by bacteria is called a biodegradable polymer. Hydroxyvalerate is a biodegradable aliphatic polyester.

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