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Which carbon-and-chlorine compounds did Michael Faraday produce in 1820?

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In 1820, Michael Faraday produced the first known compounds of carbon and chlorine, specifically $C_{2} C l_{6}$ and $C_{2} C l_{4}$ .1

These compounds were created by substituting chlorine for hydrogen in "olefiant gas" (ethylene), which represented the first substitution reactions ever induced.1