A substitution reaction, where an electrophile replaces hydrogen from a compound, is known as an electrophilic substitution reaction.
Haloarenes like benzoic acid undergo electrophilic substitution reactions of the benzene rings such as nitration, halogenation, and sulphonation.
The type of reaction where the nitro group is substituted for a hydrogen atom in a compound by using sulphuric acid and nitric acid as the reagent is called a nitration reaction.
Step 2: Nitration of benzoic acid
Nitration on benzoic acid takes preferably at the meta position as is a meta directing group, giving m-nitrobenzoic acid as the final product.
The reaction is as follows,
Therefore, m-nitrobenzoic acid is the nitration product of benzoic acid.