intelex asked in Science & MathematicsChemistry · 1 decade ago

Would you consider PCE (tetrachloroethene) a chlorinated hydrocarbon?

It seems to me that a fully chlorinated compound, such as PCE, that doesn't contain any hydrogen, should not be called a "hydrocarbon." I can buy trichloroethene, dichlorethene, and vinyl chloride being called chlorinated hydrocarbons... but not PCE.

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  • Anonymous
    1 decade ago
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    Yes PCE (tetrachloroethene) is a chlorinated hydrocarbon. ofcourse it comes under the category of hydrocarbon as this can only be obtained from a hydrocarbon by subsituting hydrogen with the chlorine.

    Similarly BHC (benzene hexachloride) is also a hydrocarbon although that also doesn't contain any hydrogen.

  • 4 years ago

    A - It can. For example thiopene (a 5 member ring with 1 sulfur) or dithiane (6 member ring with 2 sulfur) B - Absolutely false. There are no truely distinct bonds in an aromatic ring. The bond lengths are actually between that of a single and double bond. The electrons are delocalized in the ring. C - Probably not true. The name "aromatic" came about because Michael Faraday discovered benzene in oil gas and he assumpted that it was the source of the odor he smelled, while it probably was not. D - It must be unsaturated. If the ring is saturated (since benzene rings contain 3 degrees of unsaturated), the aromaticity is lost. Aromatics can be saturated with hydrogen, on teh appropriate catalyst (Rh, for example)

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