Chemistry - Biomolecules Question with Solution | TestHub

Question Explanation:

The question asks to identify the correct Haworth structure(s) of $\beta$-L-glucopyranose using the given Fischer projection of D-glucose.

Concept:

This question is based on Fischer to Haworth Conversion, Anomeric Configuration, D-L Configuration.

Solution:  

For L‑glucose, the CH₂OH group is oriented downward in the Haworth projection. In the β‑anomer, the anomeric –OH must be cis to the CH₂OH group. Among the given structures, only option (4) shows CH₂OH down and the anomeric –OH on the same side, with all other –OH orientations consistent with L‑glucose. 

Structure of  β‑D‑glucopyranose -  Structure of  β‑L‑glucopyranose