The various representations of<unk> . X-ray diffraction shows that all six carbon-carbon<unk> onds in<unk>  are of the same length, at 140 picometres (pm). The C–C<unk> ond lengths are greater than a double<unk> ond (135 pm)<unk> ut shorter than a single<unk> ond (147 pm). This intermediate distance is caused<unk> y electron delocalization: the electrons for C=C<unk> onding are distributed equally<unk> etween each of the six carbon atoms.<unk>  has 6 hydrogen atoms, fewer than the corresponding parent alkane, hexane, which has 14.<unk>  and cyclohexane have a similar structure, only the ring of delocalized electrons and the loss of one hydrogen per carbon distinguishes it from cyclohexane. The molecule is planar. The molecular orbital description involves the formation of three delocalized π orbitals spanning all six carbon atoms, while the valence<unk> ond description involves a superposition of resonance structures. It is likely that this stability contributes to the peculiar molecular and chemical properties known as aromaticity. To accurately reflect the nature of the<unk> onding,<unk>  is often depicted with a circle inside a hexagonal arrangement of carbon atoms. Derivatives of<unk>  occur sufficiently often as a component of organic molecules that the Unicode Consortium has allocated a symbol in the Miscellaneous Technical<unk> lock with the code U+232C (⌬) to represent it with three double<unk> onds, and U+23E3 (⏣) for a delocalized version.
Benzene
Nitrobenzene
Naphthalene
Vinyl chloride
Coal tar
Methanol
Alkylphenol
Triphenylchloroethylene