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Now that you know how to name structures, its time to work backwards. However, there are a few more complications.
The first of these is resonance. Chemical structures do not always come out perfectly. Sometimes, multiple structures together give a better picture of the true makeup of the compound. The primary example of this in organic chemistry is benzene.
As shown in the graphic above, while benzene has 2 triple bonds, which carbons the double bonds are between is ambiguous, as represented by the hexagon with the circle in the middle. This arrangement of atoms is extremely stable, thus it is found in many places. Cyclohexane is extremely unstable, though it's Lewis Structure looks very similar to benzene. This is because the bond angle of the carbon changes as in one structure it is sp2 instead of sp3. Benzene's carbons have a bond angle of 120 degrees, fitting well into the hexagonal structure, unlike the 109.5 degree bond angle of cyclohexane.
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