Q.Match the following :

Showing the 12 most recent of 20 on this concept.

1. CBSE 2024Set ANNUAL1 markMCQ
   Q.What is the IUPAC name of isoprene monomer of natural rubber?

   (a) 3-Methyl-1,2-butadiene

   (b) 2-Methyl-1,3-butadiene

   (c) 1,3-Butadiene

   (d) 3-Methylbutadiene

   ›Reveal solutionSolution

   Isoprene, CH2=C(CH3)-CH=CH2, is IUPAC-named 2-methyl-1,3-butadiene.

   Isoprene is a 5-carbon diene: CH2=C(CH3)-CH=CH2. Numbering the longest chain containing both double bonds (buta-1,3-diene) from one end gives double bonds at C1-C2 and C3-C4, with a methyl substituent at C2. So its IUPAC name is 2-methyl-1,3-butadiene (also called 2-methylbuta-1,3-diene) …

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2. CBSE 2024Set ANNUAL1 mark
   Q.What is the IUPAC name of the monomer unit of Polyacrylonitrile?

   ›Reveal solutionSolution

   Polyacrylonitrile is an addition polymer of acrylonitrile, whose IUPAC name is prop-2-enenitrile.

   Polyacrylonitrile (used to make fibres like Orlon/PAN, and as a precursor in carbon-fibre manufacture) is formed by addition polymerisation of its monomer, CH2=CH-CN, commonly called acrylonitrile. Naming it by IUPAC rules: the longest chain including the nitrile group is a 3-carbon chain (propene skele …

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3. CBSE 2023Set ANNUAL1 markMCQ
   Q.The monomer of Nylon-6 is -

   (a) Ethylene

   (b) Propene

   (c) Styrene

   (d) Caprolactum

   ›Reveal solutionSolution

   Nylon-6 is made by the ring-opening polymerisation of caprolactam.

   Nylon-6 is obtained by heating caprolactam (a cyclic amide, 6-aminohexanoic acid lactam) with water, which opens the ring to give an amino acid that then undergoes self-condensation (polymerisation) to give Nylon-6, a polyamide. Ethylene, propene and styrene ar …

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4. CBSE 2023Set ANNUAL1 markMCQ
   Q.Caprolactum is monomer of

   (a) Nylon 6

   (b) Nylon 6, 6

   (c) Bakelite

   (d) Terylene

   ›Reveal solutionSolution

   Caprolactam, a cyclic amide, opens and polymerises on heating to give the polyamide Nylon 6.

   Caprolactam (a 6-membered cyclic amide) is heated in the presence of water, which opens the ring; the resulting amino-acid units then undergo condensation polymerisation with each other, forming the linear polyamide Nylon 6. (Nylon 6,6 is instead made from hex …

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5. CBSE 2022Set HE2181 mark
   Q.Fill in the blank: Teflon is a polymer of ______.

   ›Reveal solutionSolution

   Teflon (polytetrafluoroethylene, PTFE) is made by free-radical addition polymerisation of tetrafluoroethene, CF2=CF2.

   Tetrafluoroethene is polymerised under high pressure using a peroxide (or persulphate) catalyst:

   n CF2=CF2 -(catalyst, high pressure)-> [-CF2-CF2-]n (Teflon) …

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6. CBSE 2022Set HE2181 mark
   Q.Answer in one word/sentence: Write the monomer of polythene.

   ›Reveal solutionSolution

   Polythene is formed by free-radical addition polymerisation of the simple alkene monomer ethene (ethylene), CH2=CH2.

   Under high pressure (~1000-2000 atm) and temperature, with a trace of peroxide catalyst, thousands of ethene molecules add on to each other, the pi-bond of each monomer opening up to form new sigma bonds to the growing chain:

   n CH2=CH2 -(catalyst, high P & T)-> [-CH2-CH2-]n (low-density polythene) …

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7. CBSE 2022Set TERM21 markMCQ
   Q.The monomer of natural rubber is:

   (a) Isoprene

   (b) Chloroprene

   (c) Phenol

   (d) None of these

   ›Reveal solutionSolution

   Natural rubber is a polymer of isoprene (2-methyl-1,3-butadiene) units joined in a cis configuration.

   Natural rubber is cis-1,4-polyisoprene: it is obtained by the polymerisation of the monomer isoprene ($CH_2=C(CH_3)-CH=CH_2$, 2-methylbuta-1,3-diene). The isoprene units link head-to-tail with all double bonds in the cis configuration, which gives natural rubber its characteristic elasticity (the cis arrangement prevents the polymer chains from p …

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8. CBSE 2022Set TERM21 mark
   Q.Draw the structure of Nylon 6,6.

   ›Reveal solutionSolution

   Nylon 6,6 is a polyamide made by condensing hexamethylenediamine (6 carbons) with adipic acid (6 carbons), losing water at each amide linkage.

   Nylon 6,6 is formed by heating hexamethylenediamine [$H_2N-(CH_2)_6-NH_2$] with adipic acid [$HOOC-(CH_2)_4-COOH$] under high pressure and temperature. This is a step-growth (condensation) polymerisation: the -NH2 of the diamine reacts with the -COOH of the diacid, releasing water at each step and building alternating amide (peptide-type) linkages along the chain. The name '6,6' records that both monomers contribute 6 carbon atoms each.

   Repeat unit / structure:

   …

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9. CBSE 2022Set ANNUAL1 mark
   Q.Identify the monomer of the polymer represented as $(-CH_2-CHCl-)_n$.

   ›Reveal solutionSolution

   PVC is the addition polymer of vinyl chloride; reversing the addition-polymerisation pattern gives back the monomer, chloroethene.

   The repeat unit $-CH_2-CHCl-$ is formed by opening the $C=C$ double bond of a vinyl-type monomer and joining the units head-to-tail. Working backwards, the monomer must be:

   $CH_2=CHCl \ (\text{vinyl chloride / chloroethene})$

   …

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10. CBSE 2020Set HE8221 mark
    Q.Write True or False: Formation of terylene is by reaction between Ethylene Glycol and Terphthalic acid.

    ›Reveal solutionSolution

    Terylene is a polyester made by step-growth (condensation) polymerisation between a diol (ethylene glycol) and a dicarboxylic acid (terephthalic acid), with loss of water at each ester linkage.

    The statement is True.

    Terylene (also called Dacron or PET, polyethylene terephthalate) is a synthetic polyester fibre prepared by heating a mixture of ethylene glycol [HOCH$_2$CH$_2$OH] and terephthalic acid [HOOC–C$_6$H$_4$–COOH] in the presence of a catalyst (e.g. zinc acetate/antimony trioxide) at high temperature:

    …

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11. CBSE 2020Set ANNUAL1 mark
    Q.Which polymer is prepared by the monomer, styrene?

    ›Reveal solutionSolution

    Styrene is an alkene bearing a phenyl group; its free-radical addition polymerisation links many styrene units end-to-end through their C=C bonds to give polystyrene.

    Styrene, C6H5-CH=CH2 (vinylbenzene), undergoes addition polymerisation (typically free-radical initiated) in which the C=C double bond of each monomer opens up and links to the next, forming a long saturated carbon backbone with a phenyl group pendant on every alternate carbon:

    …

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12. CBSE 2020Set ANNUAL1 markMCQ
    Q.Caprolactam is monomer unit of:

    (a) Dacron

    (b) Nylon 6

    (c) Teflon

    (d) Buna-N

    ›Reveal solutionSolution

    Caprolactam undergoes ring-opening self-condensation on heating with water to give Nylon 6.

    Caprolactam is a six-membered cyclic amide (lactam). On heating in the presence of a trace of water at high temperature, its ring opens and the resulting molecules undergo self-condensation (polymerisation), linking up via amide bonds to form a linear polyamide — Nylon 6 (named for the six carbons in the repeating unit). This is distinct from Nylon 6,6, which is instead made by condensing two different monomers (hexamethylenediamine and adipic acid).

    …

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