|
1 | | Which descriptors fit the following sugar best? (15.0K) |
| | A) | ketose, furanose, α |
| | B) | ketose, furanose, β |
| | C) | aldose, pyranose, β |
| | D) | aldose, pyranose, α |
|
|
2 | | Which of the following is the correct Fischer representation of D-galactose?
Hint: The structure of β-D-galactopyranose is provided. (19.0K) |
| | A) | (17.0K) |
| | B) | (16.0K) |
| | C) | (17.0K) |
| | D) | (17.0K) |
|
|
3 | | Which of the following structures is the correct Haworth representation of D-idose? (16.0K) |
| | A) | (18.0K) |
| | B) | (19.0K) |
| | C) | (18.0K) |
| | D) | (19.0K) |
|
|
4 | | Which of the following is the correct Fischer representation of (3R,4S,5S)-ketohexose? |
| | A) | (17.0K) |
| | B) | (17.0K) |
| | C) | (16.0K) |
| | D) | (17.0K) |
|
|
5 | | Which Fischer structure represents the open form of the following two anomers? (23.0K) |
| | A) | (17.0K) |
| | B) | (16.0K) |
| | C) | (16.0K) |
| | D) | (17.0K) |
|
|
6 | | Which of the following compounds does NOT undergo mutarotation? |
| | A) | glucose |
| | B) | sucrose |
| | C) | ribose |
| | D) | fructose |
|
|
7 | | D-Mannose is epimeric with D-glucose at C2. Which of the following structures represents β-D-mannopyranose? (20.0K) |
| | A) | a |
| | B) | b |
| | C) | c |
| | D) | d |
|
|
8 | | Galactose is epimeric with glucose at C4. Which of the following structures represents β-D-galactopyranose? (20.0K) |
| | A) | a |
| | B) | b |
| | C) | c |
| | D) | d |
|
|
9 | | A glycoside is shown below. What is the structure of the carbohydrate from which it was formed? (18.0K) |
| | A) | (16.0K) |
| | B) | (17.0K) |
| | C) | (17.0K) |
| | D) | (17.0K) |
|
|
10 | | A glycoside is the carbohydrate form of an |
| | A) | ether. |
| | B) | acetal. |
| | C) | aglycone. |
| | D) | alcohol. |
|
|
11 | | Which structure corresponds to methyl β-D-galactopyranoside, which is formed by the reaction of D-galactose with HCl in methanol? |
| | A) | (16.0K) |
| | B) | (17.0K) |
| | C) | (16.0K) |
| | D) | (17.0K) |
|
|
12 | | Which structure represents the β form of the glycoside formed from n-butanol and D-glucose? (21.0K) |
| | A) | a |
| | B) | b |
| | C) | c |
| | D) | d |
|
|
13 | | Which of the following structures is NOT going to give a positive test with Benedict’s reagent? (19.0K) |
| | A) | (18.0K) |
| | B) | (18.0K) |
| | C) | (18.0K) |
| | D) | (17.0K) |
|
|
14 | | What is the D-monosaccharide (open or ring form) used in the following reaction? (17.0K) |
| | A) | (20.0K) |
| | B) | (20.0K) |
| | C) | (18.0K) |
| | D) | (16.0K) |
|
|
15 | | Predict the product of the following reaction. (17.0K) |
| | A) | (18.0K) |
| | B) | (18.0K) |
| | C) | (18.0K) |
| | D) | (17.0K) |
|
|
16 | | Predict the product of the following reaction. (19.0K) |
| | A) | (18.0K) |
| | B) | (18.0K) |
| | C) | (18.0K) |
| | D) | (17.0K) |
|
|
17 | | How many aldaric acids are obtained upon nitric acid oxidation of the D- and L-aldopentoses? |
| | A) | 2 |
| | B) | 4 |
| | C) | 6 |
| | D) | 8 |
|
|
18 | | When a carbohydrate reacts with NaBH4, the product is an |
| | A) | alditol. |
| | B) | aldaric acid. |
| | C) | aldonic acid. |
| | D) | aglycone. |
|
|
19 | | Reduction of hexose A (molecular formula C6H12O6) with sodium borohydride gives compounds B and C. Compound B is optically inactive, whereas compound C is optically active. Which of the following is compound A? |
| | A) | D-fructose |
| | B) | D-glucose |
| | C) | D-mannose |
| | D) | D-galactose |
|
|
20 | | Which product will be formed in the following reaction? (15.0K) (18.0K) |
| | A) | a |
| | B) | b |
| | C) | c |
| | D) | d |
|
|
21 | | Which of the following carbohydrates cannot be used to make an aldohexose by the Kiliani–Fischer synthesis? |
| | A) | (17.0K) |
| | B) | (17.0K) |
| | C) | (17.0K) |
| | D) | (17.0K) |
|
|
22 | | In the Kiliani–Fischer synthesis, the anomeric carbon of the starting carbohydrate |
| | A) | remains as the carbonyl. |
| | B) | is lost as CO2. |
| | C) | becomes the new epimeric stereocenter. |
| | D) | becomes a nitrile carbon. |
|
|
23 | | In the Kiliani–Fischer synthesis starting from D-ribose, which pair of stereoisomers would be formed? (35.0K) |
| | A) | a and b |
| | B) | b and e |
| | C) | c and d |
| | D) | d and e |
|
|
24 | | In the following scheme, which of the following monosaccharides will give the same product as D-glucose? (23.0K) |
| | A) | (17.0K) |
| | B) | (16.0K) |
| | C) | (16.0K) |
| | D) | (17.0K) |
|
|
25 | | Which of the following structures is a D-aldotetrose that gives a meso diacid upon oxidation with dilute aq. HNO3? (21.0K) |
| | A) | a |
| | B) | b |
| | C) | c |
| | D) | d |
|
|
26 | | Which of the following aldoses gives an optically active compound upon reaction with warm, dilute nitric acid? (25.0K) |
| | A) | a |
| | B) | b |
| | C) | c |
| | D) | d |
|
|
27 | | Which of the following disaccharides fulfills the two requirements stated below?
1. α-(1,2) glycosidic linkage
2. Not a reducing sugar |
| | A) | (22.0K) |
| | B) | (21.0K) |
| | C) | (22.0K) |
| | D) | (24.0K) |
|
|
28 | | What is the product of the following reaction? (19.0K) |
| | A) | (18.0K) |
| | B) | (19.0K) |
| | C) | (19.0K) |
| | D) | (19.0K) |
|
|
29 | | Which statements are correct about the following disaccharide? (22.0K) |
| | A) | Ring A is an acetal in the α configuration; ring B is a hemiacetal in the β configuration. |
| | B) | Ring A is an acetal in the β configuration; ring B is a hemiacetal in the α configuration. |
| | C) | Ring A is a hemiacetal in the α configuration; ring B is an acetal in the β configuration. |
| | D) | Ring A is a hemiacetal in the β configuration; ring B is an acetal in the α configuration. |
|
|
30 | | How many aldose and ketose, and furanose and pyranose units are present in maltose? (21.0K) |
| | A) | 0 aldose, 2 ketose, 0 furanose, 2 pyranose |
| | B) | 1 aldose, 1 ketose, 1 furanose, 1 pyranose |
| | C) | 2 aldose, 0 ketose, 0 furanose, 2 pyranose |
| | D) | 2 aldose, 0 ketose, 1 furanose, 2 pyranose |
|