Sugar 'X': A. is found in honey; B. is a keto sugar; C. exists in α and β-anomeric forms; D. is laevorotatory. 'X' is:

Question

Sugar 'X': A. is found in honey; B. is a keto sugar; C. exists in α and β-anomeric forms; D. is laevorotatory. 'X' is:

1. A. D-Glucose
2. B. D-Fructose (Correct answer)
3. C. Maltose
4. D. Sucrose

Correct Answer

Option B — D-Fructose

Detailed Solution & Explanation

The correct answer is D-Fructose.

Key Points

• D-Fructose is present in honey (with glucose) and is a ketohexose (a keto sugar).
• It forms a cyclic (furanose) structure that exists in $\alpha$- and $\beta$-anomeric forms.
• Fructose is strongly laevorotatory, which fits all four clues (glucose is an aldose and dextrorotatory; maltose/sucrose are disaccharides).