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(D) Nucleophilic substitution bimolecular $S_{N}2$ reaction prefers a less sterically hindered site for the nucleophilic attack.Lesser the steric hind

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$CH_3Cl$

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(D) Nucleophilic substitution bimolecular $S_{N}2$ reaction prefers a less sterically hindered site for the nucleophilic attack.Lesser the steric hindrance,faster is the $S_{N}2$ reaction.The order of reactivity for $S_{N}2$ reactions is: $	ext{Methyl halide} > 1^{\circ} > 2^{\circ} > 3^{\circ}$.$S_{N}2$ reactions involve complete inversion of configuration (Walden inversion).Among the given options,$CH_3Cl$ is a methyl halide,which is the least sterically hindered and thus undergoes $S_{N}2$ reaction with complete stereochemical inversion.

The organic chloro compound,which shows complete stereochemical inversion during an $S_{N}2$ reaction,is

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