Which of the following alkenes is least reactive towards anionic polymerization?
CH2 = CHCH3
CH2 =CF2
CH2=CHCN
CH2 =CHC6H5
A
CH2 = CHCH3
B
CH2 =CF2
C
CH2 =CHC6H5
D
CH2=CHCN
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Solution
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CF2,CN and C6H5 will stabilised the negative charge that will appear after the breaking of the double bond,
but the CH3 group only exaggerates +I effect and unstabilised the negative charge, that's why the (A) alkene will be least reactive towards anionic polymerisation.
So the correct option is [A].
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