Question

The major product of the following reaction is: 

• A.
• B.
• C.
• D.

Hint:

When phthalic acid is heated with ammonia, it undergoes cyclization to form phthalimide, a key intermediate in organic synthesis.

Answer 1

The Correct Option is B

Step 1: Understanding the reaction mechanism.
- The given reaction involves phthalic acid (\( C_6H_4(COOH)_2 \)) with ammonia (\( NH_3 \)) under strong heating.
- When heated with ammonia, phthalic acid undergoes cyclization, leading to the formation of phthalimide.
Step 2: Reaction pathway.
1. Phthalic acid first reacts with ammonia to form ammonium phthalate.
2. Upon heating, a condensation reaction occurs, leading to the formation of phthalimide (structure in option B).
3. This reaction eliminates water as a byproduct.
Step 3: Identifying the correct option.
- Option A represents an incorrect amide formation.
- Option C shows incorrect amination without imide formation.
- Option D suggests excessive amination, which does not occur under these conditions.
- Option B correctly depicts phthalimide, the actual product.