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(A) The reaction involves a bimolecular nucleophilic substitution $(SN^{2})$ at the benzylic carbon. The nucleophile $PhS^-$ attacks the benzylic carb

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(A) The reaction involves a bimolecular nucleophilic substitution $(SN^{2})$ at the benzylic carbon. The nucleophile $PhS^-$ attacks the benzylic carbon from the side opposite to the leaving group $(I^-)$,resulting in an inversion of configuration. The fluorine atom on the benzene ring is not replaced because the reaction conditions favor $SN^{2}$ at the aliphatic benzylic position rather than nucleophilic aromatic substitution $(S_NAr)$ at the ring,especially given the specific stereochemical outcome required.

The major product of the following reaction is

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