The compounds in order of increasing oxidation state of carbon should be CH4, C2H6, CO, CaCO3.
The oxidation state, also referred to as the oxidation number in chemistry, is the purely theoretical charge of a particle if all of its bonds to other atoms were fully ionic.
It describes the degree to which an atom in a chemical compound has been oxidized. The oxidation state can be either positive, negative, or even zero.
These oxidation rules encompass a free, neutral element has an oxidation number of zero. The charge of a monoatomic ion is basically the oxidation number.
The oxidative state of the given compound is as follows:
Thus as per this the correct order for the given compounds is CH4, C2H6, CO, CaCO3 in terms of oxidation state.
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