In which of the following is the chain termin | vedclass

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(A) In the anionic polymerisation of $C_6H_5-CH=CH_2$ initiated by $RLi$,the active species is a carbanion,$C_6H_5-CH^{-}-CH_2R$. Since there is no me

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Polymerisation of $C_6H_5-CH=CH_2$ by $RLi$

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(A) In the anionic polymerisation of $C_6H_5-CH=CH_2$ initiated by $RLi$,the active species is a carbanion,$C_6H_5-CH^{-}-CH_2R$. Since there is no mechanism for the termination of these carbanions (unlike free radical or cationic polymerisation where termination occurs via coupling,disproportionation,or chain transfer),the chain continues to grow until the monomer is consumed. This is known as 'living polymerisation',where the chain termination step is effectively absent.

In which of the following is the chain termination step absent?

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