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ï§Carbon-based molecules are called organic compounds. ï§â¯By sharing electrons, carbon can ââ¯bond to four other atoms and ââ¯branch in up to four directions. ï§â¯compounds composed of only carbon and hydrogen are called hydrocarbons. ï§â¯A carbon skeleton is a chain of carbon atoms that can be ââ¯branched or ââ¯unbranched.
It may therefore be estimated that chemicals classified in group 1 of IARC, A1 of the ACGIH and in category 1A of the European Union are human categories. It is important to point out that substantial differences exist, comparing the three lists of carcinogens with each other.