Question

Which of the following is a ketohexose?

• A. Glucose
• B. Fructose
• C. Sucrose
• D. Starch

Hint:

A ketohexose is a six-carbon sugar with a ketone group. Fructose is the most common example.

Answer 1

The Correct Option is B

Step 1: Understanding ketohexose.
A ketohexose is a six-carbon sugar that contains a ketone group. Fructose is the only six-carbon sugar in the options with a ketone group, making it a ketohexose. Step 2: Analysis of options.
(A) Glucose: Glucose is an aldose (contains an aldehyde group) and is not a ketohexose.
(B) Fructose: Correct — Fructose is a ketohexose because it contains a ketone group at the second carbon.
(C) Sucrose: Sucrose is a disaccharide and does not fit the definition of a ketohexose.
(D) Starch: Starch is a polysaccharide and not a ketohexose.
Step 3: Conclusion.
The correct answer is (B) because fructose is the only ketohexose among the options.