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Question

Which of the following statement(s) are correct regarding the diagram shown above?

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A
It is lactose.
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B
It is composed of β-D-galactose and β-D-glucose.
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C
Left side unit is galactose and right side unit is glucose.
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D
There is a free anomeric OH group.
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Solution

The correct options are
A It is lactose.
B It is composed of β-D-galactose and β-D-glucose.
C Left side unit is galactose and right side unit is glucose.
D There is a free anomeric OH group.
One anomeric OH of β-D-glucose is free.
All other statements can be concluded using the structures of galactose and glucose in their ring form.

150163_127724_ans.png

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