The molecules cis-dichloroethylene and transdichloroethylene shown on p. 425 can be interconverted …

The molecules cis-dichloroethylene and transdichloroethylene shown on p. 425 can be interconverted by heating or irradiation. (a) Starting with cisdichloroethylene, show that rotating the C=C bond by 180^∘ will break only the pi bond but will leave the sigma bond intact. Explain the formation of trans-dichloroethylene from this process. (Treat the rotation as two stepwise 90^∘ rotations.) (b) Account for the difference in the bond enthalpies for the pi bond (about 270 kJ / mol ) and the sigma bond (about 350 kJ / mol ). (c) Calculate the longest wavelength of light needed to bring about this conversion.

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Видео The molecules cis-dichloroethylene and transdichloroethylene shown on p. 425 can be interconverted … канала Jimmy Cooper