Sugar 'X' A. is found in honey B. is a keto sugar C. exists in and -anomeric forms. D. Is laevorotatory. 'X' is :
- Maltose
- Sucrose
- D-Glucose
- D-Fructose
Answer
(4) D-Fructose
Solution
As per NCERT, fructose is obtained from honey and fruits; it is a ketohexose (keto sugar), exists in two cyclic forms ( - and -anomers of the furanose ring) and is laevorotatory, hence named D-(−)-fructose.
Glucose is an aldose and is dextrorotatory; maltose and sucrose are disaccharides, not keto sugars.
∴ 'X' is D-fructose.
Answer: (4)