Question

The structure of Sucrose is composed of:

• A. $\alpha$-D-glucopyranose and $\beta$-D-fructofuranose
• B. $\alpha$-D-glucopyranose and $\alpha$-D-glucopyranose
• C. $\beta$-D-galactopyranose and $\beta$-D-glucopyranose
• D. $\alpha$-D-glucopyranose and $\beta$-D-galactopyranose

Hint:

Remember: \[ \text{Sucrose} = \alpha\text{-D-Glucose} + \beta\text{-D-Fructose} \] It is a non-reducing sugar because both anomeric carbons participate in glycosidic bond formation.

Answer 1

The Correct Option is A

Concept: Sucrose is a naturally occurring disaccharide commonly known as cane sugar. It is formed by condensation of one molecule of glucose and one molecule of fructose.

Step 1: Recall the constituent monosaccharides. Hydrolysis of sucrose gives \[ \mathrm{Glucose + Fructose} \] in equimolar amounts.

Step 2: Identify the cyclic forms present. In sucrose: \[ \alpha\text{-D-glucopyranose} \] is linked to \[ \beta\text{-D-fructofuranose} \] through a glycosidic linkage.

Step 3: Nature of linkage. The linkage occurs between: \[ C_1 \text{ of glucose} \] and \[ C_2 \text{ of fructose} \] giving \[ \alpha(1\rightarrow2)\beta \] glycosidic bond.

Step 4: Choose the correct option. Therefore sucrose consists of \[ \boxed{ \alpha\text{-D-glucopyranose and } \beta\text{-D-fructofuranose} } \] Hence, \[ \boxed{\text{Option (1)}} \]