The scientific name of cellobiose is

4 - O - β - D

- glucopyranosyl-D-glucose.

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8 - O - β - D

- glucopyranosyl-D-glucose.

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4 N H_{2} S O_{4} - β - D

-reductase.

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6 N H_{3} P O_{4} - α - D

-reductase.

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Solution

The correct option is A $4 - O - β - D$ - glucopyranosyl-D-glucose.
Cellobiose, the disaccharide obtained by partial hydrolysis of cellulose, consists of two D-glucopyranoses joined by a 1,4,-beta-glycoside bond. Cellobiose is reducing sugar, because the anomeric carbons on the right-hand sugar are part of a hemiacetal.
Cellobiose : 4-O--D-Glucopyranosyl-D-glucose. Thus, option A is correct.
The other options are not related to the cellobiose. Thus, other options are incorrect.

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The enantiomer of $α - D - (+) -$ glucose is ?

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