Question

When carbolic acid is heated with concentrated nitric acid in presence of sulphuric acid , it forms…….
a) benzoic acid
b) phthalic acid

c) picric acid
d) benzene sulphonic acid​

Answer 1

Answer:

Nitric acid (HNO3) is an oxidizing acid and it can oxidize sulfur into its higher oxidation states (+4 or +6). According to the temperature of the concentrated nitric acid solution, sulfur is oxidized to sulfur dioxide (SO2) or sulfuric acid (H2SO4) acid.

Reaction

S + 6HNO3 → H2SO4 + 2H2O + 6NO2