The Fischer presentation of D-glucose is given below.
The correct structure(s) of β-L-glucopyranose is (are)
(A)(see structure)
(B)(see structure)
(C)(see structure)
(D)(see structure)✓ Correct
Answer: (D)
Solution
To obtain β-L-glucopyranose from D-glucose: (1) Convert D-glucose to L-glucose by inverting the configuration at all chiral centers. (2) Form the pyranose ring with the anomeric OH in β configuration (equatorial position). In β-L-glucopyranose, the anomeric OH at C-1 is in the equatorial position (up), and all other substituents have configurations opposite to those in β-D-glucopyranose. Option D shows the correct structure.
JEE Advanced · 2018 · 20 May 2018 · Paper 2 · One or more correct options
