benzene on the basis of the three-electron bond 31, urea
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benzene on the basis of the three-electron bond, urea.
Look at the picture which shows the urea molecule with the calculations.
The multiplicity of C-N bonds in the molecule of urea - 1.686. Think, this mean the C athom connected with two atoms of nitrogen (urea) bonds with a multiplicity of approximately 1.7, fold that is one of the C-N bond is almost 2. Are classical structure transmits real formula of urea molecules?
The multiplicity of C-O bond (urea) of approximately 1.5. That is the classic formula of urea (to which all accustomed to in the school and at university) almost not reflects the real structure of the urea.
Naturally, the explanation of the conjugation of the unshared pair of electrons of nitrogen with C-N bond are right. But classical formule (without arrows) does not show the structure of the molecule.
And note that the corresponding resonance structure (in which a multiplicity of the C-N bond - 2) can be written, but of course you can not write a resonance structure in which the two C-N bond have multiplicity 2.
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