Phenol on treating with concentrated ${\mathrm{H}}_2{\mathrm{SO}}_4$ at 15–20°C mainly produces

Phenol on treating with concentrated ${\mathrm{H}}_2{\mathrm{SO}}_4$ at 15–20°C mainly produces is  phenol-2-sulphonic acid

At low temperature, ortho-product is obtained.

The substance phenol is aromatic. This organic substance's chemical name is ${\mathrm{C}}_6{\mathrm{H}}_6\mathrm{O}$. Carbolic acid is another name for phenol.