Concept explainers
(a)
Interpretation:
Whether galactose and mannose are constitutional, or stereoisomers needs to be explained.
Concept introduction:
Molecules having same molecular formula and different bonding connectivity are called constitutional isomers.
Streoisomers have same molecular formula and same bonding connectivity but they differ in three-dimensional arrangement of atoms.
(b)
Interpretation:
Whether galactose and mannose are constitutional, or stereoisomers needs to be explained.
Concept introduction:
Molecules having same molecular formula and different bonding connectivity are called constitutional isomers.
Stereoisomers have same molecular formula and same bonding connectivity, but they differ in three-dimensional arrangement of atoms.
(c)
Interpretation:
Whether galactose and mannose are constitutional, or stereoisomers needs to be explained.
Concept introduction:
Molecules having same molecular formula and different bonding connectivity are called constitutional isomers.
Stereoisomers have same molecular formula and same bonding connectivity, but they differ in three-dimensional arrangement of atoms.
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CONNECT IA GENERAL ORGANIC&BIO CHEMISTRY
- (i) Which one of the following is a polysaccharide :Starch, Maltose, Fructose, Glucose?(ii) What one difference between a-helix and P-pleated sheet structure of protein.(iii) Write the name of the disease caused by the deficiency of Vitamin B12.arrow_forwardOne of the cyclic forms of D-ribose has the structure CH2OH OH ОНОН (a) How many anomeric carbon atoms are present in this structure? (b) How many hemiacetal carbon atoms are present in this structure?arrow_forward14. (a) Identify the acetal and the ketal group in the following disaccharide. (b) Decide whether the compound is a non-reducing or reducing sugar. OH НО HƠ HO Н HO Н НО HO 15. (a) Identify the glycosidic bond in the following disaccharide. (b) Decide whether the compound is a non-reducing or reducing sugar. (c) Polysaccharide units are usually bonded together with a or B 1, 6 or 1, 4 linkages. What linkage is used in the disaccharide shown below? s) НО НО НО HO НО -OH OH -H OH CH2OH 16. Draw the structure for 1,4-B-D-galactopyranosyl-D-glucose. ( но- 17. Assign an R/S designation to each chirality center in the following compound: ( CHO НО -OHarrow_forward
- (a) Draw the condensed structural formula, and give the name for the dipeptide Pro-Asn. (b) Draw the disaccharide formed by the following two monosaccharide via 1,4-linkage. In your disaccharide structure, circle and label the anomeric carbon and indicate whether you have an alpha (a) or a beta (B) anomer. CH2OH CH₂OH ОН ОН ОН ОН, ОН ОН ОН ОНarrow_forwardThe structural formula for the open-chain form of D-mannose is CH НО—С—Н Но-с—н Н—С—ОН Н—ҫ—ОН CH-OН (a) Is this molecule a sugar? (b) How many chiral carbons are present in the molecule? (c) Draw the structure of the six-member-ring form of this molecule.arrow_forwardThis substance, produced by certain soil bacteria as a defensive weapon, is used as an antibiotic. It is derived from monosaccharides. CH3 H NH₂ H₂N CH3 OH HO NH₂ CH3 NH -CH3 OH (a) How many "monosaccharide" residues are present? (b) List one way that these residues differ chemically from the monosaccharides you have I seen so far. (c) Draw an arrow pointing to one glycosidic bond. (d) Can you tell whether the bonds linking the residues have the alpha or beta configuration?arrow_forward
- Which of the following statements is not true about glucose? (i) It is an aldohexose. (ii) On heating with HI it forms n-hexanearrow_forwardRegarding 4-O- (α-D-psychofuranosyl) -β-D-allopyranose. Please indicate the RIGHT alternative: (a) The disaccharide reacts with CH3OH in an acid medium to form a glycoside that cannot be oxidized with HNO3. (b) It is a reducing disaccharide only in basic medium. (c) In the structure there is only one glycosidic bond that is of the type β 1-O-4 ' (d) The hydrolysis products of this disaccharide do not show mutarrotation. (e) The disaccharide structure contains two six-membered rings.arrow_forwardDraw the structure of: (a) a polysaccharide formed by joining D-mannose units in 1->4-ß-glycosidic linkages; (b) a polysaccharide formed by joining D-glucose units in 1->6-a-glycosidic linkages. The polysaccharide in (b) is dextran, a component of dental plaque.arrow_forward
- The structural formula for the open-chain form of galactose is CH Н—ҫ—ОН Но—С—н НО—С—Н Н—ҫ—ОН CH-ОН (a) Is this molecule a sugar? (b) How many chiral carbons are present in the molecule? (C) Draw the structure of the six-member-ring form of this molecule.arrow_forwardWhich of the following statements about the monosaccharide shown below is correct?arrow_forwardMonosaccharides can be categorized in terms of thenumber of carbon atoms (pentoses have five carbons andhexoses have six carbons) and according to whether theycontain an aldehyde (aldo- prefix, as in aldopentose) orketone group (keto- prefix, as in ketopentose). Classify glucoseand fructose in this way.arrow_forward
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