Question:
The reactive functional group in coenzyme Q is
The reactive functional group in coenzyme Q is
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Coenzyme Q (ubiquinone) works via reversible redox reactions involving its ketone (quinone) groups.
Updated On: May 13, 2026
- ester
- carboxylic acid
- ketone
- thioester
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The Correct Option is C
Solution and Explanation
Concept:
Coenzyme Q (also known as ubiquinone) is an important molecule in the electron transport chain. Its key functional feature is the presence of a quinone structure, which contains carbonyl (ketone) groups.
Step 1: Understand structure of coenzyme Q.
Coenzyme Q contains a benzoquinone ring with:
• Two carbonyl ($C=O$) groups
• These act as reactive sites
Step 2: Identify functional group.
The carbonyl groups in quinone are classified as: \[ \text{Ketone groups} \]
Step 3: Analyze other options.
• Ester → Not present
• Carboxylic acid → Not present
• Thioester → Not present
Step 4: Final conclusion.
Thus, the reactive functional group is: \[ Ketone \]
Step 1: Understand structure of coenzyme Q.
Coenzyme Q contains a benzoquinone ring with:
• Two carbonyl ($C=O$) groups
• These act as reactive sites
Step 2: Identify functional group.
The carbonyl groups in quinone are classified as: \[ \text{Ketone groups} \]
Step 3: Analyze other options.
• Ester → Not present
• Carboxylic acid → Not present
• Thioester → Not present
Step 4: Final conclusion.
Thus, the reactive functional group is: \[ Ketone \]
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