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Under acidic conditions, the alkene double bond is cloven to give the appropriate carboxylic acid:

CH3(CH2)17CH=CH2 + [O] → CH3(CH2)17COOH

Potassium permanganate oxidizes aldehydes to carboxylic acids, such as the conversion of n-heptanal to heptanoic acid:
C6H13CHO + [O] → C6H13COOH

Even an alkyl group (with a benzylic hydrogen) on an aromatic ring is oxidized, e.g. toluene to benzoic acid.
Glycols are highly reactive toward KMnO4.