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(C) $1$. The starting material is $(S)-2-	ext{butanol}$.$2$. Reaction with $P-TsCl$ (p-toluenesulfonyl chloride) in pyridine converts the $-OH$ group

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(C) $1$. The starting material is $(S)-2-	ext{butanol}$.$2$. Reaction with $P-TsCl$ (p-toluenesulfonyl chloride) in pyridine converts the $-OH$ group into a good leaving group,$-OTs$,with retention of configuration. Thus,$A$ is $(S)-2-	ext{butyl tosylate}$.$3$. Reaction of $A$ with $AcOK$ (potassium acetate) proceeds via an $S_N2$ mechanism,resulting in inversion of configuration. Thus,$B$ is $(R)-2-	ext{butyl acetate}$.$4$. Hydrolysis of $B$ with $KOH$ in $H_2O$ and heat proceeds via an $S_N2$ mechanism (or $S_N1$ depending on conditions,but here it leads to inversion),resulting in another inversion of configuration. Thus,$C$ is $(S)-2-	ext{butanol}$.

The major product $(C)$ is

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