Question

Phenytoin contains

• A. Imidazolidine dione
• B. Imidazole
• C. Pyrimidinone
• D. Oxazolinidine

Hint:

Phenytoin = Hydantoin = Imidazolidine dione.

Answer 1

The Correct Option is A

Step 1: Concept
Phenytoin is an anticonvulsant drug used to control various types of seizures.

Step 2: Meaning
It belongs to the hydantoin class of compounds.

Step 3: Analysis
Chemically, hydantoin is 2,4-imidazolidinedione. Phenytoin is 5,5-diphenylhydantoin, meaning it contains the imidazolidine dione heterocyclic core.

Step 4: Conclusion
Therefore, the characteristic ring system present in Phenytoin is Imidazolidine dione.

Final Answer: (A)