15. INTRODUCTION TO POLYMER CHEMISTRY class 12 chemistry textbook solution maharashtra board

    1. Choose the correct option from the given alternatives.

    i. Nylon fibres are —-
    A. Semisynthetic fibres
    B. Polyamide fibres
    C. Polyester fibres
    D. Cellulose fibres

    Solution

    ii. Which of the following is naturally occurring polymer ?
    A. Telfon B. Polyethylene
    C. PVC D. Protein

    Solution

    iii. Silk is a kind of —- fibre
    A. Semisynthetic
    B. Synthetic
    C. Animal
    D. Vegetable

    Solution

    iv. Dacron is another name of —-
    A. Nylon 6 B. Orlon
    C. Novolac D. Terylene.

    Solution

    v. Which of the following is made up of polyamides ?
    A. Dacron B. Rayon
    C. Nylon D. Jute

    Solution

    vi. The number of carbon atoms present in the ring of e – caprolactam is
    A. Five B. Two
    C. Seven D. Six.

    Solution

    vii. Terylene is —-
    A. Polyamide fibre
    B. Polyester fibre
    C. Vegetable fibre
    D. Protein fibre

    Solution

    viii. PET is formed by —-
    A. Addition B. Condensation
    C. Alkylation D. Hydration

    Solution

    ix. Chemically pure cotton is —-
    A. Acetate rayon
    B. Viscose rayon
    C. Cellulose nitrate
    D. Cellulose

    Solution

    x. Teflon is chemically inert, due to resence of ………..
    A. C-H bond B. C-F bond
    C. H- bond D. C=C bond

    Solution

    2. Answer the following in one sentence each.

    i. Identify ‘A’ and ‘B’ in the following reaction —-

    i. Identify 'A' and 'B' in the following
    Solution

    ii. Complete the following statements

    a. Caprolactam is used to  prepare——–
    b. Novolak is a copolymer of —— — and ———
    c. Terylene is ———-polymer of terephthalic acid and ethylene glycol.
    d. Benzoyl peroxide used in addtion polymerisation acts as ———-
    e. Polyethene consists of polymerised ———-

    Solution

    iii. Draw the flow chart diagram to show classification of polymers based on type of polymerisation.

    Solution

    iv. Write examples of Addition polymers and condensation polymers.

    Solution

    v. Name some chain growth polymers.

    Solution

    vi. Define the terms :
    1) Monomer
    2) Vulcanisation
    3) Synthetic fibres

    Solution

    vii. What type of intermolecular force leads to high density polymer ?

    Solution

    viii. Give one example each of copolymer and homopolymer.

    Solution

    ix. Identify Thermoplastic and Thermosetting Plastics from the following —–
    1. PET
    2. Urea formaldehyde resin
    3. Polythene
    4. Phenol formaldehyde

    Solution

    3. Answer the following.

    i. Write the names of classes of polymers formed according to intermolecular forces and describe briefly their structural characteristics.

    Solution

    ii. Write reactions of formation of : a. Nylon 6 b. Terylene

    Solution

    iii. Write structure of natural rubber and neoprene rubber along with the name nd structure of thier monomers.

    Solution

    iv. Name the polymer type in which  following linkage is present.

    Solution

    v. Write structural formula of the following synthetic rubbers :
    a. SBR rubber
    b. Buna-N rubber
    c. Neoprene rubber

    Solution

    vi. Match the following pairs :
    Name of polymer Monomer
    1. Teflon a. CH2=CH2
    2. PVC b. CF2=CF2
    3. Polyester c) CH2=CHCl
    4. Polythene d) C6H5OH and HCHO
    5. Bakelite e) Dicarboxylic acid
    and polyhydoxyglycol

    Solution

    vii. Draw the structures of polymers formed from the following monomers
    1. Adipic acid + Hexamethylenediamine
    2. e – Aminocaproic acid + Glycine

    Solution

    viii. Name and draw structure of the repeating unit in natural rubber.

    Solution

    ix. Classify the following polymers as natural and synthetic polymers
    a. Cellulose b. Polystyrene
    c. Terylene d. Starch
    e. Protein f. Silicones
    g. Orlon (Polyacrylonitrle)
    h. Phenol-formedehyde resins

    Solution

    x. What are synthetic resins? Name some natural and synthetic resins.

    Solution

    xi. Distinguish between thermosetting and thermoplastic resins. Write example of both the classes.

    Solution

    xii. Write name and formula of raw material from which bakelite is made.

    Solution

    4. Attempt the following :

    i. Identify condensation polymers and addition polymers from the following.

    i. Identify condensation polymers and addition polymers from the following.
    Solution

    ii. Write the chemical reactions involved in manufacture of Nylon 6,6

    Solution

    iii. Explain vulcanisation of rubber. Which vulcanizing agents are used for the following synthetic rubber.
    a. Neoprene b. Buna-N

    Solution

    iv. Write reactions involved in the formation of — 1) Teflon 2) Bakelite

    Solution

    v. What is meant by LDP and HDP? Mention the basic difference between the same with suitable examples.

    Solution

    vi. Write preparation, properties and uses of Teflon.

    Solution

    vii. Classify the following polymers as straight chain, branched chain and cross linked polymers.

    Classify the following polymers as
    Solution

    5. Answer the following.

    i. How is polythene manufactured ? Give their properties and uses.

    Solution

    ii. Is synthetic rubber better than natural rubber ? If so, in what respect?

    Solution

    iii. Write main specialities of Buna-S, Neoprene rubber?

    Solution

    iv. Write the structure of isoprene and the polymer obtained from it.

    Solution

    v. Explain in detail free radical mechanism involved during preparation of addition polymer.

    Solution