The correct statement(s) about the following sugars $\mathbf{X}$ and $\mathbf{Y}$ is(are)

(B) $\mathbf{X}$ is a non-reducing sugar and $\mathbf{Y}$ is a reducing sugar; (C) The glucosidic linkages in X and Y are $\alpha$ and $\beta$, respectively

(A) $\mathbf{X}$ is a reducing sugar and $\mathbf{Y}$ is a non-reducing sugar

(D) The glucosidic linkages in X and Y are $\beta$ and $\alpha$, respectively

JEE Advanced · 2009 · 12 Apr 2009 · Paper 2 · Biomolecules

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The correct statement(s) about the following sugars

X

and

Y

is(are)

(A) $X$ is a reducing sugar and $Y$ is a non-reducing sugar
(B) $X$ is a non-reducing sugar and $Y$ is a reducing sugar✓ Correct
(C)The glucosidic linkages in X and Y are $α$ and $β$ , respectively✓ Correct
(D)The glucosidic linkages in X and Y are $β$ and $α$ , respectively

Answer: (B), (C)

Solution

Sugar

X

has both anomeric carbons involved in the glycosidic linkage, making it a non-reducing sugar. Sugar

Y

has one free anomeric carbon, making it a reducing sugar. The glucosidic linkage in

X

α

(both OH groups on the same side), while in

Y

it is

β

(OH groups on opposite sides).

JEE Advanced · 2009 · 12 Apr 2009 · Paper 2 · One or more correct options

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