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Which of the following alkenes is least reactive towards anionic polymerisation ?A. `CH_(2)=CHCH_(3) `B. `CH_(2)=CF_(2)`C. `CH_(2)=CHCN`D. `CH_(2)=CHC_(6)H_(5)`

Answer» Correct Answer - A
In anionic polymerisation , ( on reaction with `KNH_(2)`) carbanions are the intermediates. Greater the stability of the carbanion, more reactive is the alkene. Since the stability of the carbonions decreases in the order : `H_(2)N-CH_(2)-overset(-)CHCN gt H_(2)NCH_(2)overset(-)CF_(2) gt H_(2)NCH_(2)overset(-)CHC_(6)H_(5) gt H_(2)NCH_(2)overset(-)CHCH_(3)`, therefore , the reactivity decreases in the same order . Thus `CH_(2)=CHCH_(3)` is least reactive.


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