Aliphatic vs aromatic hydrocarbon

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Irene Davila Mejia 1I
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Aliphatic vs aromatic hydrocarbon

Postby Irene Davila Mejia 1I » Sun Feb 26, 2017 11:18 pm

Could someone explain what the difference between aliphatic and aromatic hydrocarbons is? I did not really understand their definitions from what the textbook says about them. Thank you!

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Re: Aliphatic vs aromatic hydrocarbon

Postby 004583503_Lupe2E » Mon Feb 27, 2017 12:00 am

In the most simplest way of saying it:

aromatic hydrocarbon has a ring (like benzene) molecular structure.
-ARENES are under this category

aliphatic hydrocarbon does NOT have a ring shape, it has a chain like structure (like butane)
-ALKANES, ALKENES, ALKYNES are under this category

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Re: Aliphatic vs aromatic hydrocarbon

Postby Chem_Mod » Mon Feb 27, 2017 7:39 am

An aliphatic hydrocarbon is one that is completely saturated, aka no rings or double bonds.

An aromatic hydrocarbon would be like benzene, where it is placed in a cyclic structure and has alternating double bonds (called conjugation) contained within the ring. THere are more specifics like any species that has 4n+2 electrons will be aromatic, but any species with 4n electron is what is known as anti-aromatic and will be very unstable. An example of this is cyclobutadiene.

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