(Be sure to give an explanation for your answer) Arrange the following
in decreasing order of wavelengths of absorption in the ultraviolet
spectrum.
2-phenyl-1,3,5-hexatriene
1-phenyl-1,3,5-hexatriene
3-phenyl-1,3,5-hexatriene
Biphenyl
I think that the order will go (c), (a), (b) and then (d). I think that
is goes in this order because the shorter the and less the conjugated
double bonds become the lower the wavelength becomes. Therefore
3-phenyl-1,3,5-hexatriene has the most conjugated double bonds and will
absorb the greatest amount of UV and Biphenyl has the least number of
conjugated double bonds.
