Exam 2

CH 130

May 15, 1997

There are three pages and eleven questions on this exam. Be sure you have them all.

1. Describe or define precisely, providing an example

Ammonium ion (3 points)

 Prodrug (3 points)

 Acetyl group (3 points)

 Thiol (3 points)

 2. In the Amylases and Starch experiment, you placed equal amounts of an I2 solution in a string of wells and then added drops from a "sample" dropper to the wells at timed intervals.

A. Describe what was in the "sample" dropper.

(5 points)

B. Was the composition of the "sample" dropper constant during a given timed trial? Explain.

(5 points)

C. How did the color of the solution in the wells provide information about the reaction?

(5 points)

3. Draw three (3) different esters with the formula C4H8O2. Give the names of TWO of them. 

 

(5 points)

4. Cocaine is available in the two forms shown:

 

A. How might the "free base" form be converted to the other?

(5 points)

 

B. Which form is likely to be more volatile and why?

(5 points)

 

C. Which form is expected to be more soluble in water and why?

(5 points)

 

D. Why is neither form effective if taken orally, but rather must be inhaled or injected?

(5 points)

 

5. What is the reason for the formation of an "eye" when a drop of bromocresol green solution is exposed to an atmosphere containing NOx?

(5 points)

 

6. Predict the products which would result if each of the following compounds is subjected to mild oxidizing conditions, and name each of the three reactants as well as any products.

 

(15 points)

7. Provide structures for each of the following:

2-methylbutanol 2,2-dimethylpentanoic acid        ethylbutanoate  propanone

(8 points)

 

8. Draw the structure of the molecule which would result from the hydrolysis of

+ H2O (5 points)

9. Which are more volatile: similarly sized esters or carboxylic acids? Why?

 

(5 points)

 10. Draw the structure of three different amines with the formula C3H9N and circle the one which would have the lowest boiling point. Justify your answer.

(5 points)

 

 11. Which are typically more toxic to humans: small ketones or small aldehydes?

(5 points)