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(A) The reaction involves a substrate with two potential electrophilic sites: a benzylic carbon attached to a bromine atom and an aromatic carbon atta

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(A) The reaction involves a substrate with two potential electrophilic sites: a benzylic carbon attached to a bromine atom and an aromatic carbon attached to a fluorine atom. The reagent $PhS^-Na^+$ is a strong nucleophile. The benzylic position is susceptible to $S_N2$ substitution. The $PhS^-$ nucleophile attacks the benzylic carbon,displacing the $Br^-$ ion. This reaction proceeds with inversion of configuration at the chiral center. Although the aromatic ring has a strong electron-withdrawing $-NO_2$ group at the para position,which activates the ortho-fluorine for Nucleophilic Aromatic Substitution $(S_NAr)$,the $S_N2$ reaction at the benzylic position is generally faster under these conditions. Therefore,the major product is formed by the substitution of the $Br$ atom by the $PhS$ group with inversion of configuration.

The major product of the following reaction is:

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