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Question

If specific rotation of L-glucose is 53 and L-galactose is 82 and that of lactose is 54. What is specific rotation of solution formed when lactose is completely hydrolyzed?

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Solution

Lactose is disaccharide present in milk. Its hydrolysis produces D-glucose and D-galactose.
Specific rotation of D-glucose and D-galactose will +53 and +82.
So, specific rotation of solution formed by complete hydrolysis of lactose =53o + 82o2=67.5

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