Q.

Which one of the following pair is the reducing sugar?

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a

Sucrose and maltose

b

Maltose and lactose

c

Lactose and sucrose

d

Sucrose and glucose

answer is B.

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Detailed Solution

In maltose, free aldehyde group can u. produced at C- 1 of second glucose in solution and it shows reducing properties so it is a reducing sugar.Lactose is composed of β-D-galactose and β-D-glucose. The linkage is between C-1 galactose ,and C-4 of glucose. Hence, it is also a reducing sugar.
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Which one of the following pair is the reducing sugar?