Chemistry Class 12 NCERT Solutions: Chapter 15 Polymers Part 4

Download PDF of This Page (Size: 265K)

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

(i) Buna-S

(ii) Buna-N

(iii) Dacron

(iv) Neoprene

Answer:

Q_7_Table of NAmes and Structures of the Monomers and Polymers
Q_7_Table of NAmes and Structures of the monomers and Polymers

Polymer

Monomer

Structure of Monomer

i

Buna-S

1, 3-butadiene

Styrene

ii

Buna-N

1, 3-butadiene

Acrylonitrile

iii

Neoprene

Chloroprene

iv

Dacron

Ethylene glycol

Terephthalic acid

Q 7 iv Structure of Monomers

Q 7 Iv Structure of Monomers

Q 7 iv Structure of Monomers

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

(i)

(ii)

Q 18 ii Structure of Polymeric

Q 18 Ii Structure of Polymeric

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 18 Ii Ans Structure of Polymeric

Q 18 ii Ans Structure of Polymeric

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

Answer:

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

Q 19 Structure of Dacron, Ethylene Glycol and Terephthalic Acid

Q 19 Structure of Dacron, Ethylene Glycol and Terephthalic Acid

Q 19 Structure of Dacron, Ethylene Glycol and Terephthalic Acid

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

Answer:

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