Chem 212
Quiz 3a
p.1
NAME__________________________________
Alkanes & Alkenes (20 pts)
1. Convert the representation on the left into the “planar hexagon” representation discussed in
class and in the textbook:
CH3
CH3
CH3
OH
H3C
OH
H3C
CH3
2. For the structure above, what is the relationship (cis or trans) between the alcohol and the
methyl group?
cis
3. Capsaicin is the molecule in hot peppers that makes them hot. Capsaicin has a long alkane
chain. Based on this information, predict whether it is better to quench (i.e. cool) your mouth
with water or with something containing fat, such as sour cream. You must explain your
answer to receive credit.
Because capsaicin has a long alkane chain, it may be soluble in nonpolar solvents or
materials such as fat, but insoluble in water. Sour cream contains fat, which has long
alkane chains and is nonpolar, so it should dissolve the capsaicin. Water is polar and
would not dissolve capsaicin. To quench your mouth from the hot sensation of
capsaicin, you want to dissolve it and carry it away from the tongue. Therefore, sour
cream should work better than water.
4. Write a balanced equation for the combustion of 2,3-dimethylbutane
H3C
H3C
CH3
CH3
2 C6H14 + 19 O2
12 CO2 + 14 H2O
5. The reaction of chlorine with cyclopentane gives only one product. Draw the structure of that
product and give its chemical name
Cl 2, Light
Cl
+
HCl
Chlorocyclopentane
6. Draw a line angle structure for cis,cis-3,5-decadiene.