Question

When the $-OH$ group at anomeric carbon lies on the same side as that of the $-OH$ group on $C_3$ carbon, it is known as______

• A. $\beta$-D-glucose
• B. $\beta$-L-glucose
• C. $\alpha$-D-glucose
• D. $\alpha$-L-glucose

Answer 1

The correct option is A $\beta$-D-glucose

The $-OH$ at $C_3$ carbon always lies on the side opposite to that $-OH$ at $C_3$ and $C_4$ carbon in all structure of glucose the $-OH$ of anomeric carbon lies on the same side as the $C_3$ and $C_4$ carbon $-OH$ group, it is known as $\alpha$-form, Else, it is $\beta$-form.