Which one of the following is least reactive | vedclass

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(D) The correct answer is $D$ $(CH_2 = CHCl)$.In vinyl chloride $(CH_2 = CHCl)$,the lone pair of electrons on the chlorine atom is in conjugation with

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$CH_2 = CHCl$

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(D) The correct answer is $D$ $(CH_2 = CHCl)$.In vinyl chloride $(CH_2 = CHCl)$,the lone pair of electrons on the chlorine atom is in conjugation with the $\pi$-bond of the double bond.This leads to partial double bond character in the $C-Cl$ bond due to resonance.As a result,the $C-Cl$ bond is stronger and shorter than in alkyl halides,making it very difficult to break in a nucleophilic substitution reaction.Therefore,it is the least reactive among the given options.

Which one of the following is least reactive in a nucleophilic substitution reaction?

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