Kekule forms of benzene

Each of the following may be represented by at least one alternative resonance structure in which all the six membered nngs correspond to Kekule forms of benzene Write such a resonance form for each... 

They also defined a state of metaionie in which no structural formula for the so-called tautomers corresponds to the "real" structure of the reacting molecule. The Kekule forms of benzene are examples of metaionie. 74... 

This six-membered ring is not benzenoid (does not correspond to Kekule form of benzene). 

It should, therefore, be remembered that, in the representation of the electron configurations of, for example, the two Kekule forms of benzene by classical structural formulae, the bond lengths and bond angles must be considered equal, thus in this case with all C—C distances and angles equal to those in benzene. 

In the hands of Pauling this treatment has been successful in correlating many facts in terms of a number of possible structural i ormulae, and it has been widely developed by Wheland and many others. Sometimes the valence bond structures betv een which resonance is considered to take place are natural and plausible, such as the two Kekule forms of benzene on other occasions it is tiecessary to postulate less plausible structures of liigh energy such as the ionic forms of carbon dioxide see Long i ). The... 

The two Kekule forms of benzene shown in Figure 13.8 make similar approximations and do a good job of giving the structure of benzene only when taken in combination. 

Kekule form of benzene. No. The atoms satisfy a center of symmetry but the bonding does not. Notice that a C=C double bond is opposite a C C single bond. 

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