Question

razonatc structure of double bond O=C-NH2
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Answer 1

Answer:

Aromatic rings (also known as aromatic compounds or arenes) are hydrocarbons which contain benzene, or some other related ring structure. Benzene, C6H6, is often drawn as a ring of six carbon atoms, with alternating double bonds and single bonds:

This simple picture has some complications, however. (Everything in organic chemistry has complications!) Carbon-carbon single bonds are longer than carbon-carbon double bonds, so if there were "real" single and double bonds in the molecule, the shape of the benzene molecule would be a distorted hexagon:

Answer 2

Answer:

The atoms that participate in pi bonding usually reveal themselves by adopting a geometry that is compatible with this type of bonding. Atoms that are tetrahedral (sp3 hybridized) do not participate in significant pi bonding. Atoms that look like the carbons in ethylene (above right), i.e., are trigonal (sp2 hybridized), share a common plane with neighboring atoms, and are unusually close to one or more neighbors, are usually involved in significant pi bonding. To see how this works, you will build models of the molecules below (building instructions follow) and examine the geometries of the NH2 groups. By paying close attention to geometrical parameters and potential maps, you should be able to identify molecules in which the nitrogen appears to engage in pi bonding.