The major product of the following reaction is :

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🧠 The "Aha!" Moment
This sequence takes an acid toward a nitrogenous derivative. Starting with Phthalic acid, we are adding ammonia and applying heat to "zip up" the molecule into a ring.

🗺️ The Reaction Route
1. Ammonolysis: Phthalic acid (Benzene-1,2-dicarboxylic acid) reacts with ammonia to form the ammonium salt, which loses water to become Phthalamide (Compound A).
2. Intermediate (A): This has two  groups next to each other on the ring.
3. Strong Heating: Under intense heat, the molecul

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