Polycyclic aromatic hydrocarbon

Polycyclic aromatic hydrocarbons are hydrocarbons—organic compounds containing only carbon and hydrogen. It composed of multiple aromatic rings. The simplest such chemicals are naphthalene having two aromatic rings, and the three-ring compounds anthracene and phenanthrene.

(Anthracene)

(Phenabthrene)

 Polycyclic aromatic hydrocarbons are uncharged, non-polar molecules found in coal and in tar. They are also produced by the thermal decomposition of organic matter. These are abundant in the universe, and have recently been found to have formed possibly as early as the first couple of billion years after the Big Bang, Polycyclic aromatic hydrocarbons are discussed as possible starting materials for abiotic syntheses of material.





Reference:https://en.wikipedia.org/wiki/Polycyclic_aromatic_hydrocarbon