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(B) The reaction of nitrobenzene with concentrated $H_2SO_4$ at high temperature (sulfonation) yields $3$-nitrobenzenesulfonic acid as the major produ

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$3-$Nitrobenzenesulfonic acid

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(B) The reaction of nitrobenzene with concentrated $H_2SO_4$ at high temperature (sulfonation) yields $3$-nitrobenzenesulfonic acid as the major product.This is because the $-NO_2$ group is a strong electron-withdrawing group and is meta-directing for electrophilic aromatic substitution reactions.Therefore,the electrophile $SO_3$ attacks the meta-position relative to the $-NO_2$ group.

Product '$A$' in the above reaction is:

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