Functional groups of dehydration reaction | Homework Helpers

1. Geometric isomers: Select one:

a. Have the same molecular weight

b. Have the same connectivity

c. Have a different configuration about a double bond

d. All of the above

e. None of the above

 

2. Which is FALSE? Diastereomers: Select one:

a. Have the same molecular weight

b. Have the same connectivity

c. Are mirror images

d. All of the above

e. None of the above

 

3. Butane and 2-methyl-propane are: Select one:

a. Alcohols

b. geometric isomers

c. structural isomers

d. Stereoisomers

e. All of the above

 

4. Which of the following compounds does NOT contain an amine? Select one:

a. Glutamine

b. Acetate ion

c. Urea

d. Guanidinium ion

e. Creatine

 

5. Which of the following compounds results from cyclization of glucose? Select one:

a. alpha-D-glucopyronose

b. beta-D-glucopyronose

c. alpha-D-glucofuranose

d. beta-D-glucofuranose

e. All of the above

 

6. When a fatty acid reacts with glycerol, the result is- Select one:

a. Formation of an amide

b. Formation of an ester

c. Formation of hydrocarbon

d. Formation of a thio-ester

e. None of the above

 

7. Primary amines can act as bases; they can- Select one:

a. Absorb a proton to become R-NH2+2

b. Release a proton to become R-NH2+

c. Absorb a proton to become R-NH3+

d. Release a proton to become R-NH+3

e. Amines cannot either absorb or release a proton

 

8. A cyclic hemiacetal with a six-membered oxygen-containing ring is referred to as a(n): Select one:

a. aldehyde.

b. pyranose.

c. ketopentose.

d. furanose.

e. sorbitol.

9. As a result of mutarotation, D-glucose exists in all of the following forms EXCEPT: Select one:

a. L-glucopyranose.

b. alpha-anomer.

c. free aldehyde (linear)

d. beta-anomer.

e. D-glucopyranose.

10. If carbon 1 is the carbonyl group of a 6-carbon aldose (aldohexose), which carbon determines if the sugar is a D- or L- stereoisomer? Select one:

a. 1

b. 2

c. 3

d. 4

e. 5

11. A glycosidic bond would be present in: Select one:

a. acetone.

b. methyl-alpha-D-glucose.

c. 2-deoxy-beta-D-ribose.

d. glucose-6-phosphate.

e. fructose-1, 6-bisphosphate.

12. D-glucose differs from D-galactose only in the arrangement around carbon 4. Therefore D-glucose and D-galactose are- Select one:

a. enantiomers

b. epimers

c. mirror images

d. not optical isomers

e. Anomers

13. Which of the following does NOT contain a guanidinium group Select one:

a. Urea

b. arginine

c. creatine

d. guanidinium ion

14. Which of the following sugars does NOT contains an ? (1 ? 4) O-glycosidic bond? Select one:

a. amilose

b. amylopectin

c. glycogen

d. cellulose

15. Carbohydrate characteristic chemical features include: Select one:

a. the potential to form multiple hydrogen bonds.

b. the existence of one or more asymmetric centers.

c. the capacity to form polymeric structures.

d. the ability to exist in either linear or ring structures.

e. all are true.

16. Which of the following groups is NOT ionizable? Select one:

a. Guanidinium

b. Imidazole

c. Phosphoryl

d. Amine

e. Aldehyde

17. In which of the following functional groups ionization is stabilized by resonance? Select one:

a. Carboxyl

b. Hydroxyl

c. Amine

d. Aldehyde

e. All of the above

18. Which of the following functional groups does NOT contain a carbonyl? Select one:

a. Aldehyde

b. Carboxyl

c. Phosphate

d. Amide

e. Organic ester

19. Structural isomers: Select one:

a. Have the same molecular weight

b. Have the same connectivity

c. Are mirror images

d. All of the above

e. None of the above

20. D- and L- glucose are Select one:

a. stereoisomers

b. configurational isomers

c. optical isomers

d. enantiomers

e. all of the above

21. Which of the following pairs of functional groups CANNOT react with each other by a dehydration reaction? Select one:

a. Carboxyl;Hydroxyl

b. Carboxyl;Sulfhydryl

c. Phosphate;Hydroxyl

d. Amino;carboxyl

e. All can react through dehydration

22. Enantiomers: Select one:

a. Have the same molecular weight

b. Have the same connectivity

c. Are mirror images

d. Are non-superimposable

e. All of the above

23. Propane boils at -46oC. Propanol boils at 97oC. The difference is attributable to- Select one:

a. The fact that propanol is much heavier

b. The fact that propanol ionizes allowing the formation of charge-dipole bonds in water

c. The fact that propanol is the L-enantiomer of propane.

d. The fact that propanol can maintain intermolecular hydrogen bonds which propane can’t.

e. There is really no good explanation for this. It is one of the puzzles of organic chemistry.