1.

Which of the following alkenes is leastreactive towards anionicpolymerisation ?

Answer»

a. `CH_(2)=CHCH_(3) `
b. `CH_(2)=CF_(2)`
c.`CH_(2)=CHCN`
d. `CH_(2)=CHC_(6)H_(5)`

Solution :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.


Discussion

No Comment Found

Related InterviewSolutions