$\alpha$  - D – glucose and  $\beta$- D – glucose differ from each other due to the difference in one carbon with respect to its

$\alpha$  and  $\beta$ - D – glucoses differ in the arrangement of groups around one carbon atom  $\left({\text{C}}_{\text{1}}\right)$. i.e., they differ in configuration.  Hence, these are also known as anomers