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Monomers are simple molecules, which com...

Monomers are simple molecules, which combine with each other to form polymers. Each polymer has a repeating structural unit. Polymers formed the same type of monomers are called homopolymers and if two or more different repeating units (monomers) make up the polymer, it is known as a copolymer. Both homopolymers and copolymers may be formed either by addition or condensation reactions. Alkenes and diense polymerize by addition (chain growth) mechanism involving carbocations, carbanions or free radical intermediates. Diense (Chloroprene, isoprene, etc) polymerize by 1,4-addition mechanism to give cis- or trans- polymers. Natural rubber is, however, cis- polyisoprene. Natural rubber is quite soft and flexible but these properties can be improved by a process called vulcanization. In contrast, bifunctional monomer molecules undergo condensation or step-growth polymerization. Polymers which can be heated and reshaped as many times as desired are called thermoplastics (polythene, polystyrene, PVC teflon, etc.) while those which can be heated only once to give a particular shape are called thermosetting polymers (Bakelite, Melmac, etc).
Propene, styrene and ethylene glycol are:

A

copolymers

B

condensation polymers

C

homopolymers

D

monomers

Text Solution

Verified by Experts

The correct Answer is:
D
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A large number of simple molecules called monomers combine together to form a macromolecule called a polymer. Each polymer has a repeating structural unit. If the repeating structural unit is derived from one type of monomer molecules. The polymer is said to be a homopolymer and if it is derived from two or more different types of monomer molecules , the polymer is said to be a copolmer. Both homopolymers and copolymers may be formed either by addition or condensation reactions. Alkenes and dienes polymerize by addition (chain growth) mechanism involving carbocations , carbanions or free radical intermediates. Dienes (chloroprene, isoprene, etc.) polymerize by 1, 4-addition mechanism to give cis-or trans-polymers. Natural rubber is quite soft and tacky but these properties can be improved by a process called vulcanization. In contrast , bifunctional monomer molecules undergo , condensation or step-growth polymerization. Polymers which can be heated and reshaped as many times as desired are called thermoplastics , (polythene, polystyrene, PVC, teflon, etc.) while those which can be heated only once to give a particular shape are called thermosetting polymers (bakelite, melmac, etc.). Teflon, styron and neoprene are all

A large number of simple molecules called monomers combine together to form a macromolecule called a polymer. Each polymer has a repeating structural unit. If the repeating structural unit is derived from one type of monomer molecules. The polymer is said to be a homopolymer and if it is derived from two or more different types of monomer molecules , the polymer is said to be a copolmer. Both homopolymers and copolymers may be formed either by addition or condensation reactions. Alkenes and dienes polymerize by addition (chain growth) mechanism involving carbocations , carbanions or free radical intermediates. Dienes (chloroprene, isoprene, etc.) polymerize by 1, 4-addition mechanism to give cis-or trans-polymers. Natural rubber is quite soft and tacky but these properties can be improved by a process called vulcanization. In contrast , bifunctional monomer molecules undergo , condensation or step-growth polymerization. Polymers which can be heated and reshaped as many times as desired are called thermoplastics , (polythene, polystyrene, PVC, teflon, etc.) while those which can be heated only once to give a particular shape are called thermosetting polymers (bakelite, melmac, etc.). Chloroprene is the monomer unit in :

Knowledge Check

  • Monomers are simple molecules, which combine with each other to form polymers. Each polymer has a repeating structural unit. Polymers formed the same type of monomers are called homopolymers and if two or more different repeating units (monomers) make up the polymer, it is known as a copolymer. Both homopolymers and copolymers may be formed either by addition or condensation reactions. Alkenes and diense polymerize by addition (chain growth) mechanism involving carbocations, carbanions or free radical intermediates. Diense (Chloroprene, isoprene, etc) polymerize by 1,4-addition mechanism to give cis- or trans- polymers. Natural rubber is, however, cis- polyisoprene. Natural rubber is quite soft and flexible but these properties can be improved by a process called vulcanization. In contrast, bifunctional monomer molecules undergo condensation or step-growth polymerization. Polymers which can be heated and reshaped as many times as desired are called thermoplastics (polythene, polystyrene, PVC teflon, etc.) while those which can be heated only once to give a particular shape are called thermosetting polymers (Bakelite, Melmac, etc). Vinyl chloride is the repeating unit in:

    A
    polystyrene
    B
    Neoprene
    C
    PVC
    D
    polyethene

  • Monomers are simple molecules, which combine with each other to form polymers. Each polymer has a repeating structural unit. Polymers formed the same type of monomers are called homopolymers and if two or more different repeating units (monomers) make up the polymer, it is known as a copolymer. Both homopolymers and copolymers may be formed either by addition or condensation reactions. Alkenes and diense polymerize by addition (chain growth) mechanism involving carbocations, carbanions or free radical intermediates. Diense (Chloroprene, isoprene, etc) polymerize by 1,4-addition mechanism to give cis- or trans- polymers. Natural rubber is, however, cis- polyisoprene. Natural rubber is quite soft and flexible but these properties can be improved by a process called vulcanization. In contrast, bifunctional monomer molecules undergo condensation or step-growth polymerization. Polymers which can be heated and reshaped as many times as desired are called thermoplastics (polythene, polystyrene, PVC teflon, etc.) while those which can be heated only once to give a particular shape are called thermosetting polymers (Bakelite, Melmac, etc). Which of the following are examples of homopolymers?

    A
    SBR, glyptal, nylon-6,6
    B
    Nylon-6, butyl rubber, styrene rubber
    C
    Polyethene, polypropene, PVC
    D
    Melmac, bakelite, teflon

  • Monomers are simple molecules, which combine with each other to form polymers. Each polymer has a repeating structural unit. Polymers formed the same type of monomers are called homopolymers and if two or more different repeating units (monomers) make up the polymer, it is known as a copolymer. Both homopolymers and copolymers may be formed either by addition or condensation reactions. Alkenes and diense polymerize by addition (chain growth) mechanism involving carbocations, carbanions or free radical intermediates. Diense (Chloroprene, isoprene, etc) polymerize by 1,4-addition mechanism to give cis- or trans- polymers. Natural rubber is, however, cis- polyisoprene. Natural rubber is quite soft and flexible but these properties can be improved by a process called vulcanization. In contrast, bifunctional monomer molecules undergo condensation or step-growth polymerization. Polymers which can be heated and reshaped as many times as desired are called thermoplastics (polythene, polystyrene, PVC teflon, etc.) while those which can be heated only once to give a particular shape are called thermosetting polymers (Bakelite, Melmac, etc). Which of the following is not a natural polymer?

    A
    DNA
    B
    starch
    C
    Palmitate
    D
    Nylon-6 6

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    A large numberof monomers (Simple molecules) combine together to form a larger molecule ( macro molecule) called as polymer. Each polymer is made up of a repeating structural unit. A polymer is said to be homopolymer if the structural unit is derived from one type of monomer molecules. if the repeating structural unit of a polymer is derived from more than one different types of monomers, the polymer is said to a copolymer. The homopolymers as well as copolymers may be formed by addition or condensation reactions. Alekenes and dienes polymerize by additions (Chain growth) mechanism involving carbocations, carbanions or free radical intermeidates. Dienes (Chloroprene) polymerise by 1, 4 addition mechanism to give cis or trans polymers. Natural rubber is, however, cis-polyisoprene. Natural rubber is quite soft and tacky but these properties can be improved by a process called vulcanization. In contrast, bifunctional monomer molecules undergo condensation or step-growth polymerization. Polymers which can be heated and reshpaed as many times as desired are called thermoplastics (polyethene, polystyrene, PVC, teflon etc). While those which can be heated onoy once to give a particular shape are called thermosetting polymers (bakelite, melmac etc.) Chloroprene is the repeating unit in:

    Monomers are simple molecules, which combine with each other to form polymers. Each polymer has a repeating structural unit. Polymers formed the same type of monomers are called homopolymers and if two or more different repeating units (monomers) make up the polymer, it is known as a copolymer. Both homopolymers and copolymers may be formed either by addition or condensation reactions. Alkenes and diense polymerize by addition (chain growth) mechanism involving carbocations, carbanions or free radical intermediates. Diense (Chloroprene, isoprene, etc) polymerize by 1,4-addition mechanism to give cis- or trans- polymers. Natural rubber is, however, cis- polyisoprene. Natural rubber is quite soft and flexible but these properties can be improved by a process called vulcanization. In contrast, bifunctional monomer molecules undergo condensation or step-growth polymerization. Polymers which can be heated and reshaped as many times as desired are called thermoplastics (polythene, polystyrene, PVC teflon, etc.) while those which can be heated only once to give a particular shape are called thermosetting polymers (Bakelite, Melmac, etc). Which of the following, are example of thermoplastics?

    A large number of simple molecules called monomers combine together to form a macromolecule called a polymer. Each polymer has a repeating structural unit. If the repeating structural unit is derived from one type of monomer molecules. The polymer is said to be a homopolymer and if it is derived from two or more different types of monomer molecules , the polymer is said to be a copolmer. Both homopolymers and copolymers may be formed either by addition or condensation reactions. Alkenes and dienes polymerize by addition (chain growth) mechanism involving carbocations , carbanions or free radical intermediates. Dienes (chloroprene, isoprene, etc.) polymerize by 1, 4-addition mechanism to give cis-or trans-polymers. Natural rubber is quite soft and tacky but these properties can be improved by a process called vulcanization. In contrast , bifunctional monomer molecules undergo , condensation or step-growth polymerization. Polymers which can be heated and reshaped as many times as desired are called thermoplastics , (polythene, polystyrene, PVC, teflon, etc.) while those which can be heated only once to give a particular shape are called thermosetting polymers (bakelite, melmac, etc.). Which of the following sets contain only copolymers ?

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    A large number of simple molecules called monomers combine together to form a macromolecule called a polymer. Each polymer has a repeating structural unit. If the repeating structural unit is derived from one type of monomer molecules. The polymer is said to be a homopolymer and if it is derived from two or more different types of monomer molecules , the polymer is said to be a copolmer. Both homopolymers and copolymers may be formed either by addition or condensation reactions. Alkenes and dienes polymerize by addition (chain growth) mechanism involving carbocations , carbanions or free radical intermediates. Dienes (chloroprene, isoprene, etc.) polymerize by 1, 4-addition mechanism to give cis-or trans-polymers. Natural rubber is quite soft and tacky but these properties can be improved by a process called vulcanization. In contrast , bifunctional monomer molecules undergo , condensation or step-growth polymerization. Polymers which can be heated and reshaped as many times as desired are called thermoplastics , (polythene, polystyrene, PVC, teflon, etc.) while those which can be heated only once to give a particular shape are called thermosetting polymers (bakelite, melmac, etc.). Which of the following sets contains only thermoplastics ?

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