Sugar 'X'
A. is found in honey
B. is a keto sugar
C. exists in α and β – anomeric forms.
D. Is laevo

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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 :

Accepted Answer

Correct Answer: C — D-FructoseStep-by-step Solution:Verify all four properties for D-Fructose:A. Found in honey ✓: Honey contains both glucose and fructose (from enzymatic hydrolysis of sucrose by invertase).B. Keto sugar ✓: Fructose has a ketone (C=O) group at C2 → it is a ketohexose. (Glucose is an aldohexose.)C. α and β anomers ✓: Fructose undergoes mutarotation in solution — exists as α-D-fructose and β-D-fructose (5-membered furanose ring). The anomeric carbon is C2.D. Laevorotatory ✓: Despite having 'D' configuration (absolute configuration at C5), fructose rotates plane-polarised light to the LEFT (−) → [α]D = −92°. (D-glucose is dextrorotatory, [α]D = +52.5°)All four properties match D-Fructose.Why other options are wrong: Sucrose and Maltose are disaccharides; D-Glucose is an aldose (not ketose) and is dextrorotatory.Key Concepts:Ketoses vs Aldoses: Ketoses have keto group (C=O at C2); aldoses have aldehyde group (–CHO at C1).Mutarotation: Interconversion between α and β anomers in solution. Anomeric carbon = C1 (glucose) or C2 (fructose).Optical rotation: D configuration does NOT imply dextrorotatory (+). Fructose is D but laevorotatory (−).Invert sugar (honey) = glucose + fructose; overall laevorotatory because fructose's strong −92° dominates glucose's +52.5°.

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 :

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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 :

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