Question

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
• C. The glucosidic linkages in X and Y are $\alpha$ and $\beta$, respectively
• D. The glucosidic linkages in X and Y are $\beta$ and $\alpha$, respectively

Answer 1

Answer: (B), (C)

$X$ is acetal, has no free hemiacetal, hence a non-reducing sugar while $Y$ has a free hemiacetal group, it is reducing sugar. Also, glucosidic linkage of $X$ is -$\beta$ - while that of $Y$ is $\beta$-linkage.