Phthalic acid produces what acid derivative upon heating?

A) an ester
B) a carboxylate
C) an acid chloride
D) an anhydride
E) an amide

Phthalic Acid

An aromatic dicarboxylic acid, with formula C6H4(CO2H)2, it is used as a precursor to other chemicals such as dyes, perfumes, and plastics.

Acid Derivative

A compound obtained by replacing one or more of the hydroxyl groups of an acid with an organic group.

Anhydride

A compound formed from the removal of water molecules between two carboxylic acid molecules.