Biomolecules and Chemistry in Everyday Life - Result Question 25

####26. The Fischer presentation of $D$-glucose is given below.

The correct structure(s) of $\beta$-L-glucopyranose is (are)

(c)

(d)

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Answer:

Correct Answer: 26. $(a, b, c, d)$

Solution:

  1. (d) A pyranose ring is a 6 membered ring having 5 carbon atoms and one oxygen atom. In glucose, it is formed by the reaction between $>C=O$ group at position 1 and $-OH$ group at 5 th carbon atom. In general reaction between $>C=O$ group and $>C-OH$ looks like

The product formed in called hemiacetal (if $>C=O$ group belongs to an aldehyde) or hemiketal (if $>C=O$ group belongs to a ketone). $L$ - glucose has the mirror image configuration of D-glucose i.e.,

So, $\beta$ - $L$ glucopyranose is formed as

The $\alpha$-L-glucopyranose has configurational change at $C _1$ only and looks like



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