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NCERT Solutions for Class 12 Chemistry Chapter 15 – Polymers

Our NCERT Solutions for Class 12 Chemistry Chapter 15 – Polymers are user friendly and have been created by a team of Science experts. This chapter explains the terms monomer, polymer and polymerisation and encourages you to identify the applications of the same in daily life. Here you will further learn about distinguishing between different classes of polymers and types of polymerisation processes. This chapter also talks about the formation of polymers from mono- and bifunctional monomer molecules. This chapter describes the preparation of some important synthetic polymers and their properties along with uses and importance of polymers in daily life.  

There are 20 questions asked at the end of the chapter from the different concepts taught in NCERT Solutions CBSE Class 12 Chemistry Chapter 15. Some of the question types covered here are direct questions, explanatory questions and application-based questions. The questions asked are primarily based on the names of terms used in this chapter, definition of the polymerisation process, types of polymers and polymerisation, mechanism of free radical polymerisation, identification of monomers and uses of polymers in daily life.

Polymers follow the directives given by CBSE and NCERT. They help you understand the fundamental concepts thoroughly so that you can solve all the questions from this chapter asked in your Class 12 board exams and various competitive exams.

NCERT Class 12 Chemistry Chapter 15: Important Topics

NCERT Solutions for Class 12 Chemistry Chapter 15 – Polymers covers all the concepts given in the chapter. They enable you to delve deep into the concepts covered in this chapter. The outline of the concepts covered in this chapter has been given below.

  • Classification of Polymers

This part of the CBSE NCERT Class 12 Chemistry Chapter 15 tells you that macromolecules are very large molecules and are formed by joining of repeating units known as monomers and the process is called polymerisation. Based on the source, polymers are classified into three categories, natural, semi-synthetic and synthetic polymers. Based on the structure of polymers, they are divided into the linear, branched-chain and cross-linked or network polymers.

This chapter further tells you that polymers can also be classified depending upon the process through which they are made. Addition polymers are formed by repeated addition of monomer molecules to give a homopolymer, and its example is polythene. Condensation polymers are formed by repeated condensation of two different multifunctional monomers, and its example is Nylon 6,6.

This part of the chapter also classifies polymers on the basis of intermolecular forces, like elastomers, fibres, thermoplastic polymers and thermosetting polymers.

  • Types of Polymerisation Reactions

This part of the NCERT Class 12 Chemistry Chapter 15 tells you about two broad types of polymerisation reactions, addition or chain growth polymerisation and condensation or step-growth polymerisation.

Here you will learn that in the first type, molecules of the same monomer or different monomers add together in a big number to give polymer. In this, the free radical mechanism of chain growth is the most common one. Few examples are polythene, and Teflon, polyacrylonitrile.

This chapter also tells you that condensation polymerisation reaction is shown by the interaction of bi- or polyfunctional monomers containing -NH2, -OH and -COOH groups. This type of polymerisation proceeds through the elimination of some small molecules like H2O, CH3OH etc.

This chapter also teaches you about some important condensation polymerisation processes involving polyamides (Nylon 6,6 and Nylon 6), polyesters (dacron or terylene), phenol-formaldehyde polymer (bakelite) and melamine-formaldehyde polymers. 

Next, this chapter talks about polymerisation where a mixture of more than one type of monomer is allowed to polymerise to give a copolymer, an example is a butadiene-styrene polymer. 

Here you will also learn that rubber is a naturally occurring polymer (cis 1,4-polyisoprene) with elastic properties. This part of the chapter also tells you about synthetic rubbers Neoprene and Buna-N, along with the process of their preparation. 

  • Biodegradable Polymers

This part of the chapter tells that most of the polymers are resistant to natural degradation processes existing in the environment. This leads to the accumulation of waste materials causing environmental problems. PHBV and Nylon 2-nylon 6 are biodegradable man-made polymers.

CBSE NCERT Class 12 Chemistry Chapter 15 Exercise-Discussion

Our NCERT Solutions for Class 12 Chemistry Chapter 15 – Polymers consists of accurate and to the point answers to all 20 exercise questions. They elaborate in detail about all important concepts learnt in this chapter. The components of the exercise have been listed below. 

  • Question 1 is a direct question asking to explain the terms monomer and polymer.
  • Question 2 is a direct question based on the source of polymers.
  • Questions 3 and 8 are differential questions.
  • Question 4 is an explanatory question on the functionality of monomer.
  • Question 5 asks for a definition of polymerisation.
  • Question 6 is an identification question.
  • Question 7 is based on the classification of polymers on the basis of molecular forces.
  • Question 9 is an explanatory question.
  • Question 10 asks you to write a free radical mechanism of polymerisation.
  • Question 11 asks for the definition of given terms.
  • Questions 12 and 13 are memory-based and direct questions.
  • Question 14 is an explanatory question on intermolecular forces in rubber.
  • Question 15 asks to discuss the purpose of vulcanisation.
  • Questions 16 to 17 are based on monomers of given polymeric structures.
  • Question 19 is a direct question on the synthesis of dacron.
  • Question 20 is a direct question based on biodegradable polymers.

CBSE NCERT Class 12 Chapter 15 also contains 12 intext questions that also cover the main concepts taught in this chapter. They ask you about different monomers, processes of polymerisation, names of polymers, intermolecular forces in polymers etc. All of these questions have been answered systematically in our solutions.

Benefits of NCERT Solutions for Class 12th Chemistry Chapter 15 – Polymers

Some of the key benefits of learning and revising from NCERT Solutions for Class 12 Chemistry Chapter 15 – Polymers are listed below.

  • Our NCERT Solutions are drafted in a step by step manner so that you can develop a stronghold of the concepts covered in this chapter and perform exceptionally well in your board exams.
  • They are to the point yet descriptive. Hence they help you learn even the most complex concepts easily and effectively. 
  • Our NCERT Solutions have been strategically drafted to increase your retention rate, speed and efficiency.
  • The solutions are a useful tool for revision and provide you with enough practice of various question types that are important from the board exam point of view.

The solutions given describe the topics covered in the chapter in a better way while preparing you for scoring high in class 12th board exams.