Exam 1 CH 130

April, 1999

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

1. Describe or define precisely (and give an example of each case)

 

Volatile (4 points)


Bond angle (3 points)


Ether (3 points)



2. Draw two conformers and two isomers of cyclohexane, identifying which two are isomers.


(5 points)

 

Circle each of the functional groups in the molecules shown below.





(10 points)


4. Draw 5 isomers of C6H14 and give the IUPAC name of each isomer.

(10 points)

 

5. Draw the structure of 3-ethyl-3-methyl-1-hexene.

 

(5 points)

 

6. A. How many different di-chlorinated isomers would result from the reaction of the molecule CH3CH(CH3)CH3 with chlorine (two Cl per molecule)? Draw each of them.

 

(5 points)


B. Provide the IUPAC name for one of the molecules in part a.

 

(5 points)


7. A. Describe the general "molecular" structures of each of the three allotropes of carbon, and name each one:


(5 points)

Describe the characteristic physical properties of these substances, and explain why these properties are so different.

 

(5 points)


8. A. Name each of the following three alcohols and label each as to whether primary, secondary, or tertiary.

CH3CH(OH)CH3 (CH3)3COH CH3CH2OH

(6 points)


Predict the products, if any, which would result from oxidizing each of the three alcohols.


(4 points)

 

9. The following questions refer to the laboratory experiment on "60 mg a Day."

A. What is meant by the "standardization" of the DCP in the first part of the experiment?

 

(5 points)

 

B. Suppose 4 drops of grapefruit juice require 6 drops of DCP whereas 2 drops of standard 0.50 mg/mL vitamin-C solution require 10 drops of DCP. What is the concentration of vitamin-C in the grapefruit juice in mg/mL?

(5 points)


10. A. Draw five organic compounds with the molecular formula C4H8. Hint: consider cyclic structures as well as non-cyclic, and don't ignore cis-trans forms.

(10 points)

B. Circle the molecules in part A which would be expected to decolorize Br2-water and write the balanced chemical reaction for ONE such case, showing clearly the structures involved.

(3 points)


11. A short section of a polymer is shown below. What alkene monomer might be used to produce the polymer in a polymerization?

 

....... -CH2-C(CH3)2-CH2-C(CH3)2-CH2-C(CH3)2-CH2-C(CH3)2- ......

(7 points)