Question:
Which of the following is a representative structure of the butyrophenone class?
Which of the following is a representative structure of the butyrophenone class?
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Antipsychotic drugs are grouped by their chemical skeleton. One important group is the butyrophenones. The most famous and classic example of this group is Haloperidol.
Updated On: Jun 24, 2026
- Chlorpromazine
- Thioridazine
- Timolol
- Haloperidol
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The Correct Option is D
Solution and Explanation
Concept:
Antipsychotic drugs are grouped by their chemical skeleton. One important group is the butyrophenones. The most famous and classic example of this group is Haloperidol.
Step 1:
Chlorpromazine and Thioridazine belong to a different group called the phenothiazines (they share a three-ring phenothiazine structure), not the butyrophenones.
Step 2:
Timolol is not an antipsychotic at all. It is a beta-blocker used for high blood pressure and glaucoma, so it does not belong here.
Step 3:
Haloperidol has the butyrophenone backbone (a ketone group joined to a phenyl ring through a butyl chain), so it is the correct representative of this class.
Answer: Option (4) — Haloperidol.
Antipsychotic drugs are grouped by their chemical skeleton. One important group is the butyrophenones. The most famous and classic example of this group is Haloperidol.
Step 1:
Chlorpromazine and Thioridazine belong to a different group called the phenothiazines (they share a three-ring phenothiazine structure), not the butyrophenones.
Step 2:
Timolol is not an antipsychotic at all. It is a beta-blocker used for high blood pressure and glaucoma, so it does not belong here.
Step 3:
Haloperidol has the butyrophenone backbone (a ketone group joined to a phenyl ring through a butyl chain), so it is the correct representative of this class.
Answer: Option (4) — Haloperidol.
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