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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

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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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