Which of the following acid will form an (a) Anhydride on heating and (b) Acid imide on strong heating with ammonia?

Question

Canvas Classes · Accepted Answer

🧠 The "Aha!" Moment
We are looking for a dicarboxylic acid that can "wrap around itself" to form a ring. When you heat it, it loses water to form an anhydride. When you heat it with ammonia, it forms a cyclic imide. This is typical of acids where the two  groups are close together.

🗺️ Structural Potential
- Phthalic Acid (Benzene-1,2-dicarboxylic acid): Because the two acid groups are on adjacent carbons of the benzene ring, they are perfectly positioned to close a 5-membered ring.
  1. Anhyd

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