In Nucleophilic substitution reaction $R - B r + C l^{-} \to_{}^{D M F} R - C l + B r^{-}$ Which one of the following undergoes complete inversion of configuration?

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$C_{6} H_{5} C H B r C_{6} H_{5}$

$C_{6} H_{5} C H_{2} B r$

$C_{6} H_{5} C H B r C H_{3}$

${(C_{6} H_{5})}_{2} C B r C H_{3}$

answer is C.

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Detailed Solution

$C_{6} H_{5} {CHBrCH}_{3}$ Being an optically active secondary alkyl bromide undergoes $S_{N} 2$ nucleophilic substitution reaction. Hence it undergoes complete inversion of configuration.
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