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nmdcat.online June 27, 2026

The functional group that distinguishes a ketose sugar from an aldose sugar is the location of the carbonyl (C=O) group

A. At the terminal carbon in a ketose and an internal carbon in an aldose
B. Always on the first carbon in both types of sugars
C. On an internal carbon in a ketose and at the terminal carbon in an aldose
✓
D. Exclusively in the form of a carboxyl group in aldoses

📝 Explanation

The classification depends on the carbonyl group's position. If the carbonyl is at the end of the carbon chain (C1), it is an aldehyde group and the sugar is an aldose. If the carbonyl is on an inner carbon (C2 for the most common ketose, fructose), it is a ketone group and the sugar is a ketose.

📖 Additional Information

  • At the terminal carbon in a ketose and an internal carbon in an aldose
  • Always on the first carbon in both types of sugars
  • On an internal carbon in a ketose and at the terminal carbon in an aldose
  • Exclusively in the form of a carboxyl group in aldoses

The classification depends on the carbonyl group's position. If the carbonyl is at the end of the carbon chain (C1), it is an aldehyde group and the sugar is an aldose. If the carbonyl is on an inner carbon (C2 for the most common ketose, fructose), it is a ketone group and the sugar is a ketose.

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