Calculate the maximum tensile force that a polypeptide chain can withstand, assuming that the covalent bonds which hold the backbone together can be described by the Lennard-Jones potential function:
in which the values of and for carbon-carbon bonds are respectively and , while the corresponding values for carbon-nitrogen nitrogen bonds are respectively and .
Shown above are the shorthand structures of phenylacetic acid and 1-octadecylamine. Recall that lines represent two-electron bonds. Ends of lines and junctures represent carbon atoms. Finally, hydrogen atoms bonded to carbon are omitted for clarity.
The solubility of phenylacetic acid in acetonitrile is 3.87 M and the solubility of 1-octadecylamine in acetonitrile is 0.08 M
Select the response that BEST rationalizes the relative solubilities
a. The dispersion forces in 1-octadecylamine are very favorable
b. Phenylacetic acid can form hydrogen bonds with the nitrogen in acetonitrile while 1-octadecylamine cannot form hydrogen bonds with the nitrogen in acetonitrile
c. There are no favorable dipole-dipole interactions between acetonitrile and 1-octadecylamine
d. The molecular weight of phenylacetic acid is closer to the molecular weight of acetonitrile
and 
for carbon-carbon bonds are respectively 
