Categorise the following reactions as oxidation or reduction reaction indicating the oxidation state of carbon in the reactants and the products for all the reactions:

In organic chemistry, reactions can be classified into oxidation and reduction based on the changes in the oxidation state of carbon atoms in the reactants and products. 

1. Reaction 1: Oxidation of Ethanol to Acetaldehyde  
   - Reactant: Ethanol (CH₃CH₂OH)  
     - Oxidation state of carbon: -1 (in CH₃) and -2 (in CH₂OH)  
   - Product: Acetaldehyde (CH₃CHO)  
     - Oxidation state of carbon: -1 (in CH₃) and +1 (in ________ __________ ________ _____ ___ ________ ___ _______ _________ _______.
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