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(A) Step $1$: $NBS$ ($N$-Bromosuccinimide) is a reagent used for allylic or benzylic bromination. In the reaction of $o$-iodotoluene with $NBS$,the be

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(A) Step $1$: $NBS$ ($N$-Bromosuccinimide) is a reagent used for allylic or benzylic bromination. In the reaction of $o$-iodotoluene with $NBS$,the benzylic hydrogen is replaced by bromine to form $o$-iodobenzyl bromide,which is product $(A)$.Step $2$: The product $(A)$ ($o$-iodobenzyl bromide) reacts with $CH_3SNa$ (sodium methanethiolate). This is a nucleophilic substitution reaction ($S_N2$ mechanism) where the $-SCH_3$ group replaces the $-Br$ atom at the benzylic position to form $o$-iodobenzyl methyl sulfide as product $(B)$.

The product $(B)$ is

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