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What kind of substituent groups should be attached to the monomer, readily undergoing anionic polymerization?

What kind of substituent groups should be attached to the monomer, readily undergoing anionic polymerization? Correct Answer electron accepting

The monomers with electron accepting substituent groups like nitrile, carboxyl, ester groups, etc. are readily susceptible to anionic polymerization as the it enables easy carbanion formation.

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