1.

Arrange the following alkenes in order of increasing reactivity towards anionic polymerization. H_(2)C=CF_(2), H_(2)C=CHCN, H_(2)C=CHCH_(3), H_(2)C=CHC_(6)H_(5)

Answer»

Solution :Reactivity of alkene towards anoinic POLYMERIZATION increases as the stability of the INTERMEDIATE carbanion increases. The stability of the carbanion increases as :
`BH_(2)C-CH^(-)-CH_(3) lt BCH_(2)-CH^(-)-C_(6)H_(5) lt BCH_(2) -""^(-)CF_(2) lt BCH_(2)-CH^(-)-CN`
(where B is any base or a a necleophile)
Therefore, the reactivity of the corresponding alkene towards anionic polymerization increases in the same order :
`CH_(2)=CHCH_(2) lt CH_(2)=CH-C_(6)H_(5)ltCH_(2)=CF_(2)ltCH_(2)=CHCN`


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