Question

Consider following disaccharides:

List-I contains questions related to disaccharides given above and List-II contains their answers.

$\begin{array}{cc}\text{List - I}& \text{List - II}\\ \text{(I) Disaccharide (A) has a type of}& \text{(P) Aldohexose}\\ \text{glycosidic linkage:}& \\ \text{(II) Disaccharide (B) has a type of}& \text{(Q) Ketohexose}\\ \text{glycosidic linkage:}& \\ \text{(III) Disaccharide (A) will produce}& \text{(R)}(\alpha -1)\to (\alpha -1)\\ \text{monosaccharide(s) on hydrolysis:}& \\ \text{(IV) Disaccharide (B) will produce}& \text{(S)}(\beta -1)\to (\beta -2)\\ \text{monosachharide(s) on hydrolysis:}& \\ & \text{(T)}(\alpha -1)\to (\beta -1)\\ & \text{(U)}(\alpha -1)\to (\beta -2)\end{array}$

Which of the following options has the correct combination considering Lists-I and List-II?

• A. $\left(II\right),\left(R\right)$ and $\left(IV\right),\left(Q\right)$
• B. $\left(II\right),\left(R\right)$ and $\left(IV\right),\left(P\right)\left(Q\right)$
• C. $\left(II\right),\left(T\right)$ and $\left(IV\right),\left(P\right)$
• D. $\left(II\right),\left(T\right)$ and $\left(IV\right),\left(Q\right)$

Answer 1

The correct option is C $\left(II\right),\left(T\right)$ and $\left(IV\right),\left(P\right)$

(B) is $\alpha -$D-galactopyranosyl-$\beta -$L-xylopyranoside, so it has a $(\alpha -1)\to (\beta -1)$ glycosidic bond.
(A) upon hydrolysis produces aldohexose and aldopentose.