During the specific reaction of an optically active secondary alcohol with neat operating strictly via the mechanism, what critical and observable functional roles do the participating chemical specie

Question

During the specific reaction of an optically active secondary alcohol with neat $SOCl_2$ operating strictly via the $S_Ni$ mechanism, what critical and observable functional roles do the participating chemical species play?

Prashant Kotian · Accepted Answer

Correct answer: A,B,D. A) True. The first rapid step is the formation of the alkyl chlorosulphite. B) True. The defining feature of is the internal delivery of the nucleophile from within the leaving group cluster. C) False. The mechanism absolutely forbids the formation of a free, planar carbocation; if a free carbocation formed, racemisation would occur. Instead, an intimate ion pair or cyclic transition state maintains the geometry. D) True. The front-face cyclic transition state structurally forbids inversion, strictly enforcing retention.

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