consider the following pairs of saccharides (probably best to consult the slides

ID: 496614 • Letter: C

Question

consider the following pairs of saccharides (probably best to consult the slides from lecture showing all the monosaccarides,may need Google, too):

a. D-arabnose D-ribose

b. sucrose and lactose

c. D-psicose and D-tagatose

d. alpha-D-fructofuranose and alpha-D-fructopyranose

e. alpha-L-glucopyranose and beta-L-glucopyranose

f. D-erythrulose and D-erythrose

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A) f are diasteriomer; c are epimers,

B) d are anomers, and b are an aldose ketose pairs

C) c are diasteriomer; b are epimers, d are anomers, and f are an aldose ketose pairs

D) c are diasteriomer; a are epimers, e are anomers, and f are an aldose ketose pairs

E) c are diasteriomer; e are epimers, a are anomers, and f are an aldose ketose pairs

(D)

c are diasteriomer; a are epimers, e are anomers, and f are an aldose ketose pairs

* D-psicose and D-tagatose are diastereomers

* D-arabinose and D-ribose are epimers because they differ only at second carbon

* alpha-L-glucopyranose and beta-L-glucopyranose are anomers because they differ at only C1 anomeric carbon.

* D-erythrulose and D-erythrose are aldose and ketose pair because one has aldehyde functional group and the other has ketone functional group.

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