ethene 的 reaction

Ans: Reduction

To determine the type of an organic reaction, only the major organic reactant (the substrate) is considered, but not the reagent(s). In the reaction, the organic reactant (ethene) is reduced while the reagent (H2) is oxidized. Therefore, the reaction is said to be reduction.

Explanation 1:
In organic chemistry, oxidation is the reaction of gaining [O] or losing [H], while reduction is the reaction of gaining [H] or losing [O].
In the reaction, ethene gains [H] and thus the reaction is reduction.

Explanation 2:
In both ethene (CH2=CH2) and ethane (CH3-CH3), the oxidation state of H is +1.
Oxidation state of C in ethene (CH2=CH2) = [0 - (+1)x4]/2 = -2
Oxidation state of C in ethane (CH3-CH3) = [0 - (+1)x6]/3 = -3
In the conversion from ethene to ethane, the oxidation state of C decreases from -2 to -3. Therefore, reduction occurs.

可以話系oxidation,因為反應中H的氧化數由0變+1,被氧化,,所以系oxidation
此反應也系加成反應...