In a nucleophilic substitution reaction R - B | vedclass

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(C) The reaction uses $DMF$ (Dimethylformamide),which is a polar aprotic solvent,favoring the $S_N2$ mechanism.$S_N2$ reactions proceed with complete

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$C_6H_5CH(CH_3)Br$

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(C) The reaction uses $DMF$ (Dimethylformamide),which is a polar aprotic solvent,favoring the $S_N2$ mechanism.$S_N2$ reactions proceed with complete inversion of configuration (Walden inversion).Among the given options,$C_6H_5CH(CH_3)Br$ is a secondary alkyl bromide that is sterically accessible for $S_N2$ attack.$C_6H_5CH_2Br$ is primary and also undergoes $S_N2$,but $C_6H_5CH(CH_3)Br$ is the classic example of an optically active secondary halide showing inversion.$C_6H_5CH(C_6H_5)Br$ and $C_6H_5C(CH_3)(C_6H_5)Br$ are sterically hindered and likely to proceed via $S_N1$ or show mixed results.

In a nucleophilic substitution reaction $R - Br + Cl^{-} \xrightarrow{DMF} R - Cl + Br^{-}$,which one of the following undergoes complete inversion of configuration?

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Dehydrohalogenation in monohaloalkanes produces

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