The oxidized form of the molecule is quinone.
Oxidation has several definitions. Some of them are
In this case, quinone gained an electron from complex 1 to become quinol. Following the definition of oxidation as the loss of electrons, then we can say that the oxidized form of the molecule is quinone itself.
Immediate it gains an electron, it becomes reduced to quinol.
More on oxidation can be found here: https://brainly.com/question/9496279
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