Question

The two monosaccharides of sucrose are held together by a glycosidic linkage between

• A. $C _{2}$ of $\alpha$ - glucose and $C _{1}$ of $\beta$ - fructose
• B. $C _{3}$ of $\alpha$ - glucose and $C _{2}$ of $\beta$ - fructose
• C. $C _{1}$ of $\alpha$ - glucose and $C _{2}$ of $\beta$ - fructose
• D. $C _{1}$ of $\alpha$ - glucose and $C _{5}$ of $\beta$ - fructose.

Answer 1

Answer: (C)

Sucrose is formed by condensation of $\alpha-D$ glucopyranose $\left(C_{1} \alpha\right)$ unit ana $\beta - D -$fructofuranose $\left(C_{2}-\beta\right)$ unit. These units are joined by $\alpha - \beta$ glycosidic linkage between $C_1$at the glucose unit and $C_2$ at the fructose unit.