Biomolecules and Chemistry in Everyday Life 1 Question 26
28. The correct statement(s) about the following sugars $X$ and $Y$ is/are:
(2009)
(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
Assertion and Reason
Read the following questions and answer as per the direction given below:
(a) Statement I is correct; Statement II is correct; Statement II is a correct explanation of Statement I.
(b) Statement I is correct; Statement II is correct; Statement II is not the correct explanation of Statement I.
(c) Statement I is correct; Statement II is incorrect.
(d) Statement I is incorrect; Statement II is correct.
Show Answer
Solution:
- $X$ 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 ’ $\alpha$ ’ while that of $Y$ is $\beta$-linkage.
