Question:easy
Which of the following is an aldosugar?
Which of the following is an aldosugar?
Show Hint
Aldose has an aldehyde at C1; the -ulose sugars and fructose are ketoses.
Updated On: Jun 24, 2026
- Fructose
- Erythrulose
- Glucose
- None
Show Solution
The Correct Option is C
Solution and Explanation
Step 1: Sugars are named for the functional group they hold. Place an aldehyde at the end of the chain and you get an aldose; place a keto group inside the chain and you get a ketose.
Step 2: Run through the choices. Fructose is the well known fruit sugar and is a ketohexose. Erythrulose is a four carbon ketose. Both belong to the ketose family.
Step 3: Glucose, the body's main circulating fuel, has its carbonyl as an aldehyde on the first carbon. That makes it an aldohexose, the prototype aldosugar.
Step 4: Since one valid aldosugar is present, the option None can be dismissed. Memory aid: glucose, galactose, mannose, ribose and glyceraldehyde are aldoses, while fructose, ribulose and the -ulose named sugars are ketoses.
\[\boxed{\text{Glucose}}\]
Step 2: Run through the choices. Fructose is the well known fruit sugar and is a ketohexose. Erythrulose is a four carbon ketose. Both belong to the ketose family.
Step 3: Glucose, the body's main circulating fuel, has its carbonyl as an aldehyde on the first carbon. That makes it an aldohexose, the prototype aldosugar.
Step 4: Since one valid aldosugar is present, the option None can be dismissed. Memory aid: glucose, galactose, mannose, ribose and glyceraldehyde are aldoses, while fructose, ribulose and the -ulose named sugars are ketoses.
\[\boxed{\text{Glucose}}\]
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