Question

Rank the following compounds below in order of increasing oxidation level.

Rank the compounds below in order of increasing oxidation level (1 = lowest oxidation level, 4 = highest oxidation level). If two compounds are at the same oxidation level, give them the same rank. (For example, an answer might be of the form 1, 1, 3, 4 or 1, 2, 2, 4.)