What components and functional groups are the main components of organic sulfur in coal?
What components and functional groups are the main components of organic sulfur in coal ? 
Answer: (1) thioether or sulfide (RS-R');
(2) disulfide (RSS-R');
(3) a thiol or a hydroxy compound (R-SH);
(4) a thiophene heterocyclic sulfide;
(5) Thioquinone compounds.
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