Name a suitable chemical used to convert propanol to propanoic acid?

Acidified Potassium Manganate(VII).  Propanoic acid (which is a carboxylic acid) can be made by oxidising propanol (which is an alcohol). In this case, oxidation involves adding an oxygen atom and removing two hydrogen atoms. Acidified potassium manganate(VII) is used as the oxidising agent to do this.

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