Phthalic anhydride is produced by the oxidation of

Answer: Option A

Phthalic anhydride is industrially produced through the oxidation of naphthalene.

This process involves the catalytic oxidation of naphthalene in the presence of air, yielding phthalic anhydride as a key product.

Phthalic anhydride is an important chemical used in the production of plastics, resins, and dyes.