(R)-Butan-2-ol is treated with SOCl2 in the presence of pyridine. The main product is

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(R)-Butan-2-ol is treated with $SOCl X_{2}$ in the presence of pyridine. The main product is

Abutan-1-ol
B(R)-2-chlorobutane
Cracemic 2-chlorobutane
D(S)-2-chlorobutane

Answer: D

Pyridine takes up HCl and supplies free chloride, which attacks the chlorosulfite by SN2 from the back side, so there is inversion. The priority order is unchanged, so R becomes S.

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(R)-Butan-2-ol is treated with SOClX2​ in the presence of pyridine. The main product is

Answer: D

More questions on Stereochemical outcomes of substitution

(R)-Butan-2-ol is treated with $SOCl X_{2}$ in the presence of pyridine. The main product is