(5) Henry Eyring (February 20, 1901 - December 26, 1981)

4. The organic molecule benzene, C6H6, has a cyclic structure where the carbon atoms make a hexagon. The st electrons in the cyclic molecule can be approximated as having two-dimensional rotational motion. Calculate the diameter of this electron ring if it is assumed that a transition occurring at 260.0 nm corresponds to an electron going from m = 3 to m = 4. X-ray diffraction studies show that benzene is a completely flat and symmetrical molecule with all carbon-carbon and carbon-hydrogen bonds in benzene have lengths of 0.139 nm and 0.110 nm, respectively. Compare your result with the experimental data by X-ray and electron diffraction.(20%)

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(5) Henry Eyring (February 20, 1901 - December 26, 1981)

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