What is the final oxidation product of methanol when subjected toan excess of aq. KMnO4?

Methanoic acid or formic acid: .

Explanation:

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In this case, when methanol reacts with a strong oxidizing agent as potassium permanganate, the first oxidation product is methanal (formaldehyde) as shown below:

Afterwards, the methanal continues reacting with the potassium permanganate to finally yield methanoic acid (formic acid):

This is understood by the fact that oxidation in organic chemistry is also related with the increase of oxygen atoms in the oxidized molecule.

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