Which of the following alkenes is least reactive towards anionic polymerization?

{C H}_{2}

{C H C H}_{3}

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{C H}_{2}

{C F}_{2}

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{C H}_{2}

= C H C N

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{C H}_{2}

{C H C}_{6} H_{5}

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Solution

The correct option is A ${C H}_{2}$ = ${C H C H}_{3}$
$C F_{2}, C N$ and $C_{6} H_{5}$ will stabilised the negative charge that will appear after the breaking of the double bond,
but the $C H_{3}$ 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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