# Question #480c6

The reaction you describe matches the profile of an electrophilic aromatic substitution. If I'd have to guess what compound $\text{A}$ is, I'd say benzene, which will classify the reaction as the nitration of benzene
The first step in the nitration of benzene is the creation of the nitronium ion, ${\text{NO}}_{2}^{+}$, which is obtained by the removal of one electron from the nitrogen dioxide molecule, or ${\text{NO}}_{2}$.
Since it is the stronger acid, sulfuric acid will protonate nitric acid on the $\text{OH}$ group and allow for the loss of a water molecule and the formation of the nitronium ion.