Concise Physical Chemistry

c18 JWBS043-Rogers September 13, 2010 11:29 Printer Name: Yet to Come

304 EXPERIMENTAL DETERMINATION OF MOLECULAR STRUCTURE

Problem 18.12

Some polyenes,...C C C C C C C..., and so on, are colored (lycopene in

tomatoes, for example). Use the particle in a one-dimensional box to predict how

long the conjugated chain must be for its absorption frequency to be in the visible

region.

Problem 18.13

A reaction product is thought to be either methyl acetate or ethyl formate. NMR

analysis produced the spectrum shown below. Which is it?

6 4 2 TMS