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I know that polyols that have at least two hydroxyl group attached to two adjacent carbons can react with copper (II) hydroxide forming a complex, eg:
     Cu(OH)₂ + 2 C₃H₅(OH)₃ -> [C₃H₅(OH)₂O]₂Cu + 2 H₂O
     Cu(OH)₂ + 2 C₂H₄(OH)₂ -> [C₂H₄(OH)O]₂Cu + 2 H₂O
     My question is that what are the rules for which OH group will get its H removed and how are these substances called? Also, do these polyols also react with Copper salt?