First slide

Disaccharides

Question

Optical activity is one of characteristic property exhibited by carbohydrates. All the following are Laevorotatory except

Moderate

A

Invert Sugar
B

Fructose
C

Sucrose
D

Ribose

Solution

Sucrose is dextrorotatory. Specific rotation of sucrose is $+ 66 . 5^{o}$
Invert sugar is equimolar mixture of glucose ( $+ 52 . 5^{o}$ )and fructose $(- 92 . 4^{o})$ . It is laevorotatory.
Ribose is laevorotatory;
All have D configuration

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