1. Primary amines can act as bases; they can- Select one: a. Absorb a proton to

Question

1. 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

2. 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.

3. 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.

4.

Butane and 2-methyl-propane are:

Select one:

a. Alcohols

b. geometric isomers

c. structural isomers

d. Stereoisomers

e. All of the above

5.

D- and L- glucose are

Select one:

a. stereoisomers

b. configurational isomers

c. optical isomers

d. enantiomers

e. all of the above

6.

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

7. Which of the following functional groups does NOT contain a carbonyl?

Select one:

a. Aldehyde

b. Carboxyl

c. Phosphate

d. Amide

e. Organic ester

8.

Which of the following groups is NOT ionizable?

Select one:

a. Guanidinium

b. Imidazole

c. Phosphoryl

d. Amine

e. Aldehyde

9.

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

10. 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.

Explanation / Answer

1. Primary amines can act as bases; they can-
Select one:
c. Absorb a proton to become R-NH3+ ( correct answer)

2. Propane boils at -46oC. Propanol boils at 97oC. The difference is attributable to-

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

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

a. L-glucopyranose.

4.

Butane and 2-methyl-propane are:

Select one:

c. structural isomers

5.

D- and L- glucose are

Select one:

c. Optical isomers

6.

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:

e. 5

7. Which of the following functional groups does NOT contain a carbonyl?

Select one:

c. Phosphate

8.

Which of the following groups is NOT ionizable?

Select one:

e. Aldehyde

9.

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

Select one:

e. Anomers

10. Carbohydrate characteristic chemical features include:

Select one:

e. all are true.

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