Refer to the monosaccharides below to answer the following questions. A. Sorbose

Question

Refer to the monosaccharides below to answer the following questions. A. Sorbose B. Rhamnose C. Erythrulose D. Xylulose E. Glucose i) Classify each sugar by type: kefoheptose, aldobutose etc. Sorbose Rhamnose Erythrulose Xylulose Glucose From the sugars above, choose the one(s) that fit each description below ii) a D-sugar iii) a deoxy sugar iv) a sugar with 3 stereogenic centers v) Draw both chair conformations of the alpha-anomer of rhamnose in its pyranose form. Circle the more stable conformation.

Explanation / Answer

NOTE: Only four items were answered because that stated in the rules of Chegg.

I)

a) Sorbose: Ketohexose

b) Rhamnose: Methyl-pentose or a 6-deoxy-hexose

c) Erythrulose: Ketotetrose

d) Xylulose: Ketoheptose

e) Glucose: Hexose

II) a D-sugar: Xylulose and Glucose.

III) a deoxy sugar: Rhamnose and Glucose.

IV) a sugar with 3 stereogenic centers: Xylulose.*

*Sorbose, Rhamnose and Glucose have 4 stereogenic centers.

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