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(D) The reactivity of the halogen atom towards nucleophilic substitution depends on the strength of the $C-X$ bond.In $chloroethane$ $(CH_3CH_2Cl)$,th

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Chlorobenzene,$vinyl$ chloride,chloroethane

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(D) The reactivity of the halogen atom towards nucleophilic substitution depends on the strength of the $C-X$ bond.In $chloroethane$ $(CH_3CH_2Cl)$,the $C-Cl$ bond is a pure single bond,making it the most reactive.In $vinyl$ chloride $(CH_2=CHCl)$ and chlorobenzene $(C_6H_5Cl)$,the $C-Cl$ bond acquires partial double-bond character due to resonance,which makes the bond shorter and stronger,thus reducing reactivity.Between $vinyl$ chloride and chlorobenzene,the $C-Cl$ bond in chlorobenzene is more stable due to the delocalization of electrons over the entire benzene ring.Therefore,the ascending order of reactivity is: $Chlorobenzene < Vinyl 	ext{ } chloride < Chloroethane$.

The set of compounds in which the reactivity of the halogen atom in ascending order is:

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