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

The correct statement(s) about the following sugars $X$ and $Y$ is (are)
  1. $X$ is a reducing sugar and $Y$ is a non-reducing sugar
  2. $X$ is a non-reducing sugar and $Y$ is a reducing sugar
  3. the glucosidic linkages in $X$ and $Y$ are $\alpha$ and $\beta$, respectively
  4. the glucosidic linkages in $X$ and $Y$ are $\beta$ and $\alpha$, respectively

Solution

$X$ has acetal linkage and $Y$ has hemiacetal linkage. Carbohydrate with hemiacetal linkage are reducing sugars and carbohydrate with acetal linkage are non reducing sugars. $X$ is $\alpha$ anomer and $Y$ is $\beta$-anomer of $D(+)$ glucose.

Asked in: JEE Advanced 2009 (Paper 2)

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