MCQ
The organic chloro compound, which shows complete sterochemical inversion during a $S_{N^{2}}$ reaction, is
  • A
    $(C_2H_5)_2CHCl$
  • B
    $(CH_3)_3CCl$
  • C
    $(CH_3)_2CHCl$
  • $CH_3Cl$

Answer

Correct option: D.
$CH_3Cl$
d
Nucleophilic substitution bimolecular $S_{N^{2}}$ prefers less sterically hindered site to attack. Lesser the steric hindrance faster the $S_{N^{2}}$ reaction. So ease of reaction is $1^{o}>2^{o}>3^{o}$

$S_{N^{2}}$ involves inversion of configuration stereo, chemically. since, $1^{o}$ alkyl halides are prone to $S_{N^{2}}$ reactions, therefore $\mathrm{CH}_{3} \mathrm{Cl}$ undergoes complete strerochemical inversion.

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