What is the common name of the aromatic dicarboxylic acid with carboxyl groups on adjacent ring carbons (1,2-benzenedicarboxylic acid)?
Answer and explanation
Correct answer: B. Phthalic acid
1,2-benzenedicarboxylic acid is phthalic acid (which readily dehydrates to phthalic anhydride). 1,3-benzenedicarboxylic acid is isophthalic acid, and 1,4-benzenedicarboxylic acid is terephthalic acid (used in PET plastics).
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