Question

18. Which of the following compound(s) would undergo mutarotation in aqueous solution?

19. Draw the chair conformation of a-D-galactopyranose.

20. Which of the following compound(s) is a glycoside?

21. Provide the reagents neccesary to carry out the following conversion.

22. Predict the product(s) for the following reaction.

23. D-glucose & D-galactose are ______epimers of each other.

24. Predict the product(s) for the following reaction.

25. Which of the following compound(s) would produce D-glucose and D-mannose when treated with HCN followed by H2/Ps/BaSO4/H2O-Killiani-Fisher synthesis?

26. Which of the following compound(s) would give a positivd Tollen's test?

27. Which one of the following compounds is a non reducing sugar?

28. Which one of the following is a correct structure for maltose?

29. Which one if the following is a correct structure for sucrose?

30. Which of the following monosaccharide(s) are produced when starch is completely hydolyzed?

31. When D-glucose is trated with aqueous NaOH it undergoes____.

32. The predominant form or specie of an aqueous solution for D-glucose is:

33. Which of the following statements about glucose is NOT correct?

34. Raffinose is a trisaccharide found in whole grains. Which is the correct description of the glycosidic linkage(s) in Raffinose?

35. Which of the following is a-D-arabinopiranose?

36. What statement about sucrose is false?

37. The most stable conformation for B-D-galactopyranose is:

38. Classify the enlace glycoside bond as a or B and identify the monosacharide(s) that is (are) produced frim total hydrolysis of both salicin and solanine.

1. In a-amino acuds the amino and carboxylic acid groups are separates by____,

2. Amino acids are connected to each other by______

18. Which of the following compound(s) would undergo mutarotation in aqueous solution? CH2OH CH, OH - CHOCH CH, OH -O OHOH OH OOCH Конон OH Oooo W I OH OH OH OH III b) II & III c) III & IV d) I, II & III e) all of these 19. Draw the chair conformation of C-D-galactopyranose. 20. Which of the following compound(s) is a glycoside? OCH онно- HO OH OH OCH 21. Provide the reagents necessary to carry out the following conversion осно

Answer 1

Solution 18

All reducing sugars will undergo mutarotation.

Solution 18 Mutarotation :- Mutaso tation is change' ùn the optical rotation of a Salution, when somer's inter Convert: X-D-Glucose F B -D-Glucose. te Limix Coptical rotatien) of mixture would change When .-D-Glucose starts convert into B-D-Glucose, or vice-versa. The equilibrium set up via sing opening of the Cyclic A Structure of Sugar and that is only possible if Carbohydrates have free -01 Group at anumeric . Carbon. Hence Carbohydrates which have free-oh Group cat anomedic carbon Wouled show mutarotation In other words, the reducing sugars would Show mutarotation. I) CH2014 -001 KOH V hoy Oly OH ~ free -OH present at anomenic Carbon ie Hemiacetal :) . So, reducing Sugar Hence & will show motarotation - 7

CH2OH DH a oH Kot . free -OH at anomeric carbon Hence reclucing sugur so will show motarotation W CH2DCH3 OH OH free -OH at anomeric Carbon Hence reducing Bugar. So. cit will show motarotation. 애 (W) CH, DH 017 OH 04 No free -Oh Goop at Cunomeric Carbon, hence' not a reducing sugar hence would not undergo motarotation . CX) to Corsect Answer (d) — (I),(II), (II)