Which of the following compounds undergoes nu | vedclass

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(C) racemic mixture is formed during nucleophilic substitution when the reaction proceeds via an $S_N1$ mechanism,which involves the formation of a pl

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$(b), (c)$

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(C) racemic mixture is formed during nucleophilic substitution when the reaction proceeds via an $S_N1$ mechanism,which involves the formation of a planar carbocation intermediate.This intermediate can be attacked by the nucleophile from either side with equal probability.Compounds that can form stable carbocations (like tertiary or secondary alkyl halides that are chiral) are more likely to undergo $S_N1$ reactions.In compound $(a)$,$CH_3-CH(Br)-C_2H_5$ is a secondary chiral alkyl halide,which can form a stable carbocation and undergo $S_N1$ substitution.In compound $(b)$,$CH_3-C(Br)(CH_3)-C_2H_5$ is a tertiary chiral alkyl halide,which readily forms a stable tertiary carbocation and undergoes $S_N1$ substitution.In compound $(c)$,$CH_3-CH(C_2H_5)-CH_2Br$ is a primary alkyl halide,which typically undergoes $S_N2$ reactions (inversion of configuration) rather than $S_N1$ (racemization).Therefore,compounds $(a)$ and $(b)$ are the ones that can form a racemic mixture.

Which of the following compounds undergoes nucleophilic substitution by $OH^-$ ions to form a racemic mixture?

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