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Anionic polymerization may be accomplish...

Anionic polymerization may be accomplished with

A

styrene

B

acrylonitrile

C

methyl methyacrylate

D

All of these

Text Solution

Verified by Experts

The correct Answer is:
D
Alkene monomers containing electron withdrawing groups such as `- C_(6) H_(5)` (in styrene, `C_(6) H_(5) CH = CH_(2)) - CN` in acrylonitrile, `CH_(2) = CHCN)` and `- COOR` (in methyl methacrylate, `CH_(2)=C-underset(CH_(3))underset(|)(C)OOCH_(3))`etc. Can be
Polymerized by an anionic mechanism as well as by a free radical mechanism.
Electron-withdrawing groups are able to stablize the carbanionic intermediate which propagates the chain.
Anionic polymerization (which like free radical polycerization occurs by a chain reaction path way) is initiated by strong bases such as `NH_(2)`,
and `n - Bu^(-)` (provided by an organometallic `BiLi`). Greater the stability of carbanion intermediate, more facile is the anitonic polymerization.
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Define Polymerization.

In cationic polymerizalion, the initiator is an electrophile that adds to the alkene, causing it to become a cation. The Initiator most often used in cationic polymerization is a lewis acid. Such as BF_(3) or AICI_(3) and in anionic polymerization, the iniliator is a nucleophile that reacts with the alkene to form a propagating site that is an anion. Arrange the following group of monomers of decreasing ability to undergo cationic polymerization

Knowledge Check

  • Somatic hybridization is accomplished by

    A
    Fusion of two protoplasts from similar species
    B
    Fusion of two protoplasts from two species
    C
    Fusion of two protoplasts from sperm and egg
    D
    Chromosome doubling in androgenic cultures

  • In cationic polymerizalion, the initiator is an electrophile that adds to the alkene, causing it to become a cation. The Initiator most often used in cationic polymerization is a lewis acid. Such as BF_(3) or AICI_(3) and in anionic polymerization, the iniliator is a nucleophile that reacts with the alkene to form a propagating site that is an anion. Which of the follówing represents anionic polymerisation?

    A
    `Bu-Li+CH_(2)=underset(CN)underset(|)(CH)`
    B
    `BF_(3)+CH_(2)=C(CH_(3))_(2)`
    C
    D

  • Somatic hybridisation is accomplished by

    A
    Grafting between two varieties
    B
    Fusion of two protoplast of different varieties of plants
    C
    Chromosome doubling in androgenic culture
    D
    Recombinant DNA technology

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    In cationic polymerizalion, the initiator is an electrophile that adds to the alkene, causing it to become a cation. The Initiator most often used in cationic polymerization is a lewis acid. Such as BF_(3) or AICI_(3) and in anionic polymerization, the iniliator is a nucleophile that reacts with the alkene to form a propagating site that is an anion. What monomer and what type initiator would you use to synthesize following polymer ?

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