Haloalkanes and HaloareneshardMCQ SINGLE⭐ Must-Do

In the synthesis of pure alkyl chlorides via Darzen's procedure, treating an alcohol with yields retHaloalkanes and Haloarenes Chemistry Question

Question

In the synthesis of pure alkyl chlorides via Darzen's procedure, treating an alcohol with $SOCl_2$ yields retention of configuration. What happens to the stereochemistry if the reaction is conducted in the presence of pyridine?

Answer: B

💡 Solution & Explanation

Pyridine neutralizes the $HCl$ byproduct, liberating free $Cl^-$ nucleophiles. This forces the mechanism from internal return ($S_Ni$) to a classical bimolecular $S_N2$ backside attack, yielding strict inversion.

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