The formula of gentiobiose $(C_{12} H_{22} O_{11})$ is as given. Identify the correct statement for gentiobiose.

It is a reducing sugar

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It form osasone derivative

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Form a mixture of

D

and

L

glucose or hydrolysis with enzyme emulsion

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It mutarotates in solution

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Solution

The correct options are
A It is a reducing sugar
B It mutarotates in solution
C It form osasone derivative
Gentiobiose contains free aldehyde group. Hence it shows all the properties shown by free aldhyde group.
These include reducing nature, formation of osazone derivative and mutarotation in solution.
Hence, options A, B and D are correct.
Hydrolysis of gentiobiose by the enzyme emulsin produces D-glucose as the only product. Hence, option C is incorrect.

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C_{12} H_{22} O_{11}

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A) On hydrolysis, lactose gives β-D-galactose and β-D-glucose

B) In lactose C₁ of β-D-galactose has acetal structure and C₁ of β-D-glucose has hemiacetal structure

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