Exam 2

CH 130

May, 2000

There are 5 pages and 26 questions on this exam. Be sure you have them all.

Write your answers to the multiple choice questions in the numbered boxes on the last page of this exam. Each of the 24 multiple choice problems are worth 3.8 points.

1. All of the following are properties of amines EXCEPT

A. They frequently have offensive odors.

B. Those that can form hydrogen bonds have higher boiling points than expected for their molecular weight.

C. Those with low molecular weight are soluble in water.

D. They react with acids to form amides.

E. They act as bases in many reactions.

2. All of the following statements concerning the carbonyl group in aldehydes and ketones are true EXCEPT

A. The bond is polar, with a slight negative charge on the oxygen atom.

B. The bond angles about the central carbon are 120.

C. The carbonyl group is planar.

D. In condensed form the carbonyl group can be written as -CHO or -CO-.

E. Because the bond is polar, carbonyl groups readily form hydrogen bonds with each other.

3. Which of the following is an example of a primary amine?

A. B. C.

D. E.

4. What is the product of the reduction of 3-methyl-2-pentanone?

A. 3-methyl-2-pentanol

B. 2-methyl-3-pentanol

C. 3-methyl-2-pentanal

D. 3-methyl-2-pentene

E. no reaction

5. A compound with an -OH group and an ether-like -OR group bonded to the same carbon atom is a(an)

A. acetal B. aldol C. diol D. hemiacetal E. simple ether

6. If methylamine reacts with hydrochloric acid, the major product will be

A. ammonium chloride

B. dimethylammonium chloride

C. methylammonium chloride

D. trimethylammonium chloride

E. methylammonium hydroxide

7. The products of basic hydrolysis of an ester are

A. another ester and water

B. alcohol and carboxylic acid

C. alcohol and water

D. carboxylic acid and water

E. carboxylate ion and alcohol

8. All of the following statements about carboxylic acids are true EXCEPT

A. They undergo substitution reactions involving the -OH group

B. At low molecular weights they are liquids with sharp stinging odors

C. They form hydrogen bonds, causing their boiling points to be higher than expected on the basis of molecular weight

D. They react with bases to form salts which are often more soluble than the original acid

E. When they behave as acids, the -OH group is lost leaving the CO^- ion

9. Which molecule is a ketone?

A.

B.

C.

D. E.

10. Which equation best represents the dissociation of a carboxylic acid in water?

A. CH₃COOH + H₂O CH₃COOH₂⁺ + OH^-

B. CH₃COOH CH₃COO^- + H⁺

C. CH₃COOH + H₂O CH₃COO^- + H₃O⁺

D. CH₃COOH + H₃O⁺ CH₃COOH₂⁺ + H₂O

E. CH₃COOH + 2 H₂O CH₃COO^- + 2 H₃O⁺

11. Which structure represents a zwitterion?

A. B. C.

D. E.

12. Which pair of compounds can react to form a hemiacetal?

A. CH₃CH₂CHO and CH₃CH₂OH

B. CH₃COCH₃ and CH₃CH₂CHO

C. CH₃CH₂CHO and CH₃COOH

D. CH₃COCH₃ and CH₃COOH

E. CH₃COOH and CH₃CH₂OH

13. When an amine behaves as a base it ______ a hydrogen ion to form a(an) _______ ion.

A. loses ; hydronium

B. loses ; ammonium

C. loses ; hydroxide

D. gains ; ammonium

E. gains ; hydronium

14. Which carboxylic acid is used to prepare the ester shown?

A. CH₃-CH₂-COOH B. CH₃-COOH

C. (CH₃)₂-CH-COOH D. (CH₃)₂-CH-CH₂-COOH E. CH₃-(CH₂)₃-COOH

15. Which of the following statements about Nylon is true?

A. Nylon is a polyester

B. Nylon will not dissolve in strong acid or base

C. Nylon is the product of the reaction between a dicarboxylic acid and a dialcohol

D. Nylon is the product of the reaction between a dicarboxylic acid and a diamine

E. The monomers in Nylon are bonded together by hydrogen bonds

16. The peptide bond joining amino acids into proteins is a specific example of the _____ bond.

A. amide B. carbonyl C. ester D. glycosidic E. hydrogen

17. Two functional groups that are present in all amino acids are the _____ group and the _____ group.

A. hydroxyl ; amide

B. carboxyl ; amine

C. carboxyl ; phosphate ester

D. acetal ; amine

E. carbonyl ; amide

18. Which molecule is an alpha amino acid?

A. B. C.

D. E.

19. Reaction of an ester with a strong base is called

A. reverse esterification

B. esterification

C. saponification

D. oxidation

E. condensation

20. What is the common name of the molecule shown?

A. acetic acid

B. ascorbic acid

C. formic acid

D. lactic acid

E. oxalic acid

21. In lecture we discussed the molecule shown to the right, whose optical isomers are responsible for the taste and odor of caraway and spearmint. Which carbon is chiral?

A. 1

B. 2

C. 4

D. 6

E. none of these choices

22. Which of the following statements about soap is NOT true?

A. When fat is saponified, the products are soap and glycerol

B. The polar carboxylate end of the soap molecule makes it soluble in water

C. The non-polar tail of the soap molecule is attracted to oily dirt

D. Soap is produced when fatty acids react with glycerol

E. Detergent is designed to work better than soap in hard water

23. Regarding the lessons of the Acid Deposition experiment, which of the following is NOT true?

A. Certain acids can move through the atmosphere by gaseous diffusion

B. The "eye" forms in the blue indicator drop when acid is deposited in the outer surface of the drop

C. The product of the gaseous reaction between HCl and NH₃ is a solid

D. Marble statues are corroded by basic raindrops

E. Acid rain is dropping the pH of lakes and natural waters

24. Which of the following statements is NOT true?

A. A chiral molecule is superimposable on its mirror image

B. Optical isomers of each other have the same solubility in water

C. Optical isomers will generally react differently with a chiral molecule

D. All but one natural amino acids are chiral

E. All natural proteins are chiral

25. Label the lowest boiling amine in the following set.

26. Write the family name (such as carboxylic acid) beneath each of the following

Multiple choice answers: put the correct letter in each box

# Multiple.Ch.______×3.8 = ______ Points from 25+26 _______ Total Exam Points ________