7) which statement is not true for the following structure: 7) Which statement i
ID: 492046 • Letter: 7
Question
7) which statement is not true for the following structure:7) Which statement is NOT true for the following structure CH20H CH20H HO H OH H H H OH A) There are two oses and 0 furanose B) The linkage between the two monosaccharide units is B1 4 C) This is a reducing sugar D) Two monosaccharides are joined by glycosidic bond. 8) The anomeric carbon in the following D-glucose is in which position? Which carbon determines the D-configuration? Is it or B anomer? CH2OH OH 2 OH OH 3 OH E 2, 6, D) 5, 6, B C) 2, 3, A) 1, 5, B) 1, 6, B
Explanation / Answer
7) The disaccharide has two pyranose (six membered ) rings linked by beta 1-> 4 between two monosacharide units.
two monosaccharides joined by beta glycosidic bond.
One ring is an acetal, other is a hemiacetal. Thus it is reducing sugar.
The hemiacetal is in equilibrium with openchain aldehyde in solution, so it can be oxidised by Cu+2 .
Thus staement e is wrong.
8) The anomeric carbon is the carbon attached to two oxygens, it the C-1.
The highest numbered chiral carbon in the sugar dtermines the D- configuration, that is the C-5 in gluclose.
The givenstructure is alpha glucose. as the C-1 H is down wards.
The correct option is A.
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