The least oxidized to most oxidized forms in each example are provided.
The sequence for the least oxidized to most oxidized forms in each example is as follows:
A) Carbon dioxide, methanal, methanol, methane
B) Ethane, ethanal, ethanol, ethanoic acid
C) Methane, methanol, methanal, methanoic acid
Carbon dioxide is the most oxidized form as it has the highest number of carbon-oxygen bonds, while methane is the least oxidized form as it only contains carbon-hydrogen bonds. As you move along the sequence, additional carbon-oxygen bonds are formed, increasing the oxidation state of the carbon atom.