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Chapters 21 and 22 1. Consider the structure shown on the right and answer the following questions about it (fill in blanks or circle proper choice). f4 tl a. Its molecular formula is CH,O 似 and so it fits the general formula for a carbohiydrate, which is C(O b. Specifically, this structure is (a D) an L.) (aldojketo) (pent/hex (ase/ c. Will it be optically active? s d. If the top carbon was converted to a CH,OfH, would it be optically active? D e. This molecule can form a six membered ring by addition of one of its -OH groups to the C-O group. Draw a circle around the -O group which would lead to this ring. This is called a (furanose/pyranose) ing. Draw the structure of this ring in the space on the right Oll f. This molecule can also form a five membered ring by addition of one of its -OH groups to the C-O group. Draw a square around the -OH group which would lead to this ring. This is called a (furanose/pyranose) ring. g. In each of the rings referred to in parts e and f the carbonyl carbon has been carbon. Draw a circle around this carbon converted into a hemi ofexal in your ring structure in part e. h. As the rings in parts e and f form, the C-O group yields a new chiral center which is called the meric carbon. This new chiral center has an-OH group which is typically drawn either up or down in its cyclic form. The "up" form is called (α /4) and the down form is called (dr). In the polysaccharide starch, the the linkages from one saccharide to another are all (a / p) 5. In the space on the right draw the structure of the disaccharide a-D-galactopyranosyl -(1-4)-a-D-galactopyranose

Answer 1

13e но trom он IP

Ilen Ho ot aciiive OH